A ball is dropped it on a floor and bounces back to a height somewhat less then the original height. The curve which its motion correctly about y and t is

Options

A.
B.
C.
D.

Answer

B

Explanation

When a ball is dropped on a floor,
`y= (1)/(2) g t^(2)` ..(1)
So the graph between y and t is a parabola. Here as time increases, y decreases.
When the ball bounces back, then
`y = u t+ (1)/(2) g t^(2)` …(2)
The graph between y and t will be a parabola. But here as time increases. y also increases. So (b) represents the graph.