A 10-Kilogram Block with an Initial Velocity of 10 M/s

Multiple Choice

A 10-kilogram block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface and comes to rest. It takes the block 2 seconds to stop. The stopping force acting on the block is
About

A) 25 N.
B) 10 N.
C) 50 N.
D) 5 N.
E) none of these