A rope exerts a force
on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/s 2 near the surface of the earth.
-What is the kinetic energy of the crate when it is 4.0 m above the floor?
A)400 J
B)250 J
C)116 J
D)704 J
E)1180 J

Question

A rope exerts a force
 on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/s 2 near the surface of the earth. 
-What is the kinetic energy of the crate when it is 4.0 m above the floor?
A)400 J 
B)250 J 
C)116 J 
D)704 J 
E)1180 J

Quizplus · Accepted Answer

Kinetic energy = 1/2 mv^2 = 1/2 * m * (2gh) = 1/2 * m * (2 * 9.8 m/s^2 * 4.0 m) = 400 J

A Rope Exerts a Force