Question

a body of mass 5 kg is acted upon by a constant force of 20N for 7 sec.the total change in momentum will be

Answer 1

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ans.4000J

Explanation:

Given mass mass of a body m =5 kg

initial velocity of the body u = zero

force acting on a body F = 20N

time for which the force acts t = 10s

if a is the acceleration produced in the body

a=F/m= 20/5=4m/square

let v the velocity of the body after 10s

clearly ,v = u +at =0 +(4) multiply (10) =40m/square

kinetic energy acquired by the body

Ek=1/2 mvsquare =1/2(5) multiply (40)sq = 4000 J

Answer 2

Answer:

answer is 4000j. hope it helps you..