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Laws of Motion
Question
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A block of mass M is placed on frictionless surface and given a jerk by average force of F which acts for time t. What is the velocity acquired by the block?

Answer

Average force, F acts on the body for time t. 
Therefore, impulse of force is,
                                I = Ft 

Impulse is equal to change in momentum.
If V is the velocity acquired by body after jerk, then change in momentum of body will be mv. 
∴ Impulse, I = Ft = MV 
That is,      V = Ft/M, is the velocity acquired by the block. 

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