All Questions page - 503

A car starts from rest and accelerates uniformly at a rate of 2 ms^-1 for 20 second. It then maintains a constant velocity for 10 second. The brakes are then applied and the car is uniformly retarded and comes to rest in 5 second. Draw the velocity - time graph for the motion and find :

(i) the maximum velocity

(ii) the retardation in the last 5 second

(iii) total distance traveled and (iv) average velocity.

A stone is dropped from the top of a tower 400 m high and at the same time another stone is projected upward vertically from the ground with a velocity of 100 ms^-1 . Find where and when the two stones will meet.

Two trains are moving in opposite directions. Train A moves east with a speed of 10 ms^-1 and train B moves west with a speed of 20 ms^-1 . What is the

(i) relative velocity of B w.r.t A and

(ii) the relative velocity of ground w.r.t B.

(iii) A dog is running on the roof of train A against its motion with a velocity of 5 ms^-1 w.r.t train A. What is the velocity of the dog as observed by a man standing on the ground?

Two trains A and B of length 200 m each are moving on two parallel tracks with a uniform speed of 10 ms^-1 in the same direction, with the train A ahead of B. The driver of train B decides to overtake train A and accelerates by 1 ms^-2. If after 50 s, the guard of train B brushes past the driver of train A, what was the original distance between the two trains?

A body is thrown vertically up from the top of a building with a velocity of 10 ms^-1 . It reaches the ground in 5 s. Find the height of the building and the velocity with which the body reaches the ground. (g = 10 ms^-2 ).

The names of 5 students from section A, 6 students from section B and 7 students from section C were selected. The age of all the 18 students was different. Again, one name was selected from them and it was found that it was of section B. What was the probability that it was the youngest student of the section B?

A bag contains 35 balls of three different colors viz. red, orange and pink. The ratio of red balls to orange balls is 3 : 2, respectively and probability of choosing a pink ball is 3/7. If two balls are picked from the bag, then what is the probability that one ball is orange and one ball is pink?

There are total 18 balls in a bag. Out of them 6 are red in colour, 4 are green in colour and 8 are blue in colour. If Vishal picks three balls randomly from the bag, then what will be the probability that all the three balls are not of the same colour?

Ram and Shyam are playing chess together. Ram knows the two rows in which he has to put all the pieces in but he doesn’t know how to place them. What is the probability that he puts all the pieces in the right place?

A child paints the six faces of a cube with six different colors red, blue, pink, yellow, green and orange. What is the probability that red, pink and blue faces share a common corner?

Three children took part in racing competition in their school with their respective probabilities to reach the finishing point being 1/3, 1/5 and 1/4 respectively. What is the probability that at least one of them will finish the race?

A tiffin box contains x pink and (x – 4) yellow toffees and another tiffin box contains (x – 1) yellow and (x – 3) pink toffees. If one of the tiffin box is selected at random and 2 toffees are drawn at random from the box thus selected, the probability that the two toffees are of different colours is 67/132. Find the total number of toffees in the first tiffin box?

Aarti gave her project assignment to a shopkeeper for binding. There were 19 pages including a cover page, 12 pages of theory and 6 pages of drawings. She told the shopkeeper that the theory pages are in a particular order and the drawing pages can be arranged anywhere provided they are together. If the cover page is always kept first what is the probability that rest of the pages are arranged as per requirement?

If the letters of the word “CRACKJACK” are rearranged in a random manner, what is the probability that vowels are neither together nor at the ends?

A basketball game is played between team Blue and Red. There are a total of 9 players in each team and 5 will play in the game. Ankit is in team blue and Vaibhav is in team Red. What is the probability that at least one of ankit or vaibhav is in playing five?

Three identical dices are rolled together, what is the probability that the product of all three outcomes on the three dices will be even?

A goldsmith has a bag, which contains some colourful stones. It contains 4 White and 8 Black stones. There is another bag which contains 5 White and 5 Black stones. One stone is to drawn from either of the two bags. What is the probability of drawing a White stone?