Question

Consider a rubber ball freely falling from a height h = 4.9 m onto a horizontal elastic plate . Assume that the duration of collision is negligible and collision with the plate is totally elastic . Then ,the velocity as a function of time the height as function of time will be [AIEEE 2009] ​

Answer 1

Explanation ;-As we know that for vertical motion

• h = 1/2gt² [parabolic]
• v = -gt and after the collision ,
• v = gt (straight line )
• Collision is perfectly elastic , then ball reaches to same height again and again with same velocity .

Since, option (c) is correct