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# Spring Force from Graph

APPH12-1VEJ8J

A $5.0\text{ kg}$ box is attached to a horizontal spring with spring constant $77\text{ N/m}$ which is attached to a wall. The mass is then pulled back $25\text{ cm}$ and released from rest. The graph above shows data collected with a motion detector for the box’s velocity at various moments in time after it has been oscillating.

Which of the following best approximates the magnitude of the force acting on the box from the spring at time $t = 0.4\text{ seconds}$?

A

$0\text{ N}$

B

$6\text{ N}$

C

$19\text{ N}$

D

$1925\text{ N}$