An object with a kinetic energy of 40 J is stopped in a distance of 0.01 m. The average force that stops the object is
A) 40,000 N.
B) 4,000 N.
C) 400 N.
D) 40 N.
E) 0.4 N.

Question

Quizplus · Accepted Answer

The work done to stop the object is equal to its initial kinetic energy, which is 40 J. The work done by the stopping force can also be calculated using the formula Work = Force x Distance. Setting these equal gives us 40 J = Force x 0.01 m, solving for Force gives us 4000 N.

An Object with a Kinetic Energy of 40 J Is