SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

A ball falls under gravity from a height of 10 m with an initial downward velocity  It collides with theground, loses 50%of its energy in collision and then rises back to the same height. Find (i) the initial velocity  and (ii) the height to which the ball would rise after collision if the initial velocity was directed upwards instead of downwards?

a)

b)

c)

d)


Question ID - 100230 :-

A ball falls under gravity from a height of 10 m with an initial downward velocity  It collides with theground, loses 50%of its energy in collision and then rises back to the same height. Find (i) the initial velocity  and (ii) the height to which the ball would rise after collision if the initial velocity was directed upwards instead of downwards?

a)

b)

c)

d)

1 Answer
5876 Votes
3537

Answer Key : (b) -

(b)

TE at initial point

After collision,remaining energy

Hence,

(since after collision,it rebounds to same height )

 m/s

The ball would rise to the same height after collision if the initial velocity was directed upwards instead of downwards. Since while returning to the same point, the body would possess the same velocity in the downwarddirection, hence  =10 m



Next Question :

A man stands at one end of the open truck which can run on frictionless horizontal rails. Initially, the man and the truck are at rest. Man now walks to the other end and stops. Then which of the following is true?

a)

The truck moves opposite to direction of motion of the man even after the man ceases to walk

b)

The centre of mass of the man and the truck remains at the same point throughout the man’s walk

c)

The kinetic energy of the man and the truck are exactly equal throughout the man’s walk

d)

The truck does not move at all during the man’s walk


View Topper Answer

We hope we have given the updated helpful answer / content for your query in an easily accessible format to help you in preparing adequately. We do offer free support materials, 10th maths guide, 10th science guide, 10th tamil guide, 10th social guide, 10th english guide, science 10th guide and also for all the classes books and guide to all the students who sign up for SaraNextGen. Apart from traditional textbook queries, we've got conjointly provided further high order level thinking issues, that are seemingly to be expected in boards and competitive exams. It includes conceptual queries, MCQs, Long and short answer type queries, etc. These Questions are designed to learn each student and academics by providing chapter-wise further issues focusing totally on testing conceptual information with applications. Here, we've got provided a number of the necessary ways in which within which the solutions of all the Questions will profit students of class 1 to 12. If you have any queries, drop a message to us and we will get back to you at the earliest.


SaraNextGen