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A body of mass 5 kg initially at rest undergoes an acceleration of 4 m/s 2 , when subjected to a certain force .what is the kinetic energy attained by the

body at the end of 10 second


I think it's 40j because
i.e 1/2*5*4²

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srry,i didnt noticed that 10
no actually the answer is 400 J
if u can then pls try to do it .....
may be,multiply that present Ek by the time taken(10)
Let velocity after 10s be v
                           t=10 s  , m =5kg  a =4m/s²
               We have v = at = 4*10=40m/s
                KE= mv²/2= 5*40²/2=4000 joules
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mark as the best
but the ans is 400J
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