a 20g ball hits a wall at 45º angle with a speed of 15m/s and rebounds perpendicular to the direction of incidence with same speed .Find the impulse received by the ball
Asked by SUMITA
24th May 2019,
9:19 AM
Answered by Expert
Answer:
The impulse is given by
Here we are assuming that the collision with the wall is purely elastic. As the object is moving in 2D we will analyse the motion horizontally and vertically seperately.
Vertical momentum before collision
Horizontal momentum before collision
After collision
vertical
Horizontal
Therefore
Fdt=
No change in vertical momentum before and after collision hence change in vertical momentum would be zero.
The change in horizontal momentum is
Impulse=
Answered by Expert
24th May 2019,
12:09 PM
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