A force of 2N accelerates a mass of 0.2kg moving with velocity 10m/s for 4s and then stops acting. calculate the displacement in 4s and displacement in the next 4s.
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It is given that force is 2N,mass of body is 0.2kg,initial velocity is 10m/s,and time for which force acts is 4s.Now for finding the displacement,we need acceleration(a) which can be found out using Newton's First Equation of Motion,F=ma. Since we have got a which is 10m/s*2,we can find displacement for first 4s by using Second Equation of Motion,s=ut+1/2at*2 which gives 120m and then for next 4s,total time will be 4s+4s that is 8s and by putting 8s in value of t in Second Equation of Motion,s=ut+1/2at*2 and same values of a and u.
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