# Motion under Gravity: Janice Jumper's Trampoline Jump

## How does gravity affect Janice Jumper's movement after she leaves the trampoline?

A. Gravity causes her to move faster

B. Gravity causes her to decelerate

C. Gravity has no effect on her movement

## Answer:

B. Gravity causes her to decelerate

Gravity plays a significant role in Janice Jumper's movement after she leaves the trampoline. As she is subject to the force of gravity once she leaves the trampoline, gravity causes her to decelerate or slow down.

The acceleration due to gravity on Earth is approximately 9.8 m/s², which means that Janice will experience a deceleration force of 9.8 m/s² acting against her initial velocity. This causes her to slow down in the upward direction.

When calculating her velocity after a certain time period, we can use the kinematic equation V = V0 - at, where V is the final velocity, V0 is the initial velocity, a is the acceleration (negative when moving upward against gravity), and t is the time in seconds.

Therefore, gravity affects Janice Jumper's movement by causing her to decelerate after leaving the trampoline.