About 40 J is required to push a crate 4 m across a floor. If the push is in the same direction as the motion of the crate, the force on the crate is about
A. 4 N.
B. 10 N.
C. 40 N.
D. 160 N.
Answer:B
About 40 J is required to push a crate 4 m across a floor. If the push is in the same direction as the motion of the crate, the force on the crate is about
A. 4 N. B. 10 N. C. 40 N. D. 160 N.