A 40-Kg Block Slides Along a Frictionless Surface with a Constant

Multiple Choice

A 4.0-kg block slides along a frictionless surface with a constant speed of 5.0 m/s as shown. Two seconds after it begins sliding, a horizontal, time-dependent force is applied to the mass. The force is removed eight seconds later. The graph shows how the force on the block varies with time.
-What, approximately, is the speed of the block at t = 11 seconds?

A) 5.0 m/s
B) 16 m/s
C) 25 m/s
D) 65 m/s
E) 75 m/s