Subject :NSO Class : Class 9
A ball is dropped on to the floor from a height of 20 m. It rebounds to a height of 10 m. If the ball is in contact with the floor for 0.1 seconds, what is the average acceleration during contact?
A 142 m s-2
B 285 m s-2
C 338 m s-2
D 564 m s-2
Ans 1:
Class : Class 10