A2.0-kilogram body is initially traveling at a velocity of 40. meters per second east.
if a constant force of 10. newtons due east is applied to the body for 5.0 seconds, the final speed of the body is

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Change in momentum = force * time = 10 * 5.0 = 50 kg-m/s 
Change in velocity = change in momentum/mass = 50/2.0 = 25 m/s towards east 
Final velocity = initial velocity + change in velocity = 40 + 25 = 65 m/s towards east 
Final speed = magnitude of final velocity = 65 m/s 
Ans: 65 m/s