A vertical spring is compressed and when released applies a force during a 0.25 s time interval to a 17 g frog,which is flung upward due to the applied force from the spring.If the frog attains a velocity of 11 m/s after being released from the spring,what average force was applied by the spring?
A) 0.21 N
B) 0.91 N
C) 0.75 N
D) 0.17 N
E) 0.58 N

Question

Quizplus · Accepted Answer

The average force can be calculated using the impulse-momentum theorem: Impulse = Change in momentum. Impulse = Force × time, and Change in momentum = mass × change in velocity. So, Force = (mass × change in velocity) / time = (0.017 kg × 11 m/s) / 0.25 s = 0.748 N, which is approximately 0.91 N.

A Vertical Spring Is Compressed and When Released Applies a Force