Question

9.
A ball
is dropped from the certain height on the
surface of glass. It collides elastically and comes back
to its initial position. If this process it repeated then
the velocity time graph is :
(Take downward direction as positive)
velocity
25 E
velocity
velocity
21
nas
velocity
TO
2T​

Answer 1

Answer:

(C)

Explanation:

Convention: Downward direction as positive

1) Initially,

Ball will go down with increasing velocity linearly with time.

As, By Newton's Equations

v=u+at = 0+gt

=> Initially, Graph will be linear in time.

2) After reaching bottom, ball will go up with same speed as it strikes the ground but direction will be opposite.

After that, graph will be such that initial velocity is negative.

Then, velocity starts increasing and reaches 0.

Then, again same thing happens.

Hence, Graph will be of (3) option.