Question

Which of the following curves represents the $v-t$ graph of an object falling on a metallic surface and bouncing back?

• A.
• B.
• C.
• D.

Answer 1

Answer: (D)

When an object falls down its acceleration is downwards and constantly $g$. Its velocity is downward. On bouncing its velocity is upward but acceleration is still downward and constantly $g.v-t$ graph should have same slope in both phases of motion, one half must be positive velocity and the other half must be negative velocity.