Question

if a ball is thrown at an angle theta from horizontal with speed v then we know that it will land with same speed at horizontal.So if we calculate change in velocity when it lands on surface again then the change in velocity is -2vsin thetajcap. but it should be zero as landing launching speed are same. So why change in velocity is not zero

Answer 1

Answer:

I have assumed that the mirror and incident ray are both being rotated anticlockwise.

You can solve similar problems by taking the old normal and the new normal and then using properties such as

Angle made by incident and reflected raywith the normal are equal.

Angle made by the incident and the reflected ray with the mirror is equal.

Normal at 90° with the mirror surface. etc.

Answer 2

Answer:

=> I have assumed that the mirror and incident ray are both being rotated anticlockwise.

You can solve similar problems by taking the old normal and the new normal and then using properties such as

Angle made by incident and reflected raywith the normal are equal.

Angle made by the incident and the reflected ray with the mirror is equal.

Normal at 90° with the mirror surface etc.

Explanation:

FOLLOW ME..