Question

a force of 10 N acts for 20secs on a body initial at rest calculate the energy required by the body and work done by the applied force​

Answer 1

Answer:

10KJ

Explanation:

F         = ma

F         = m x (v-u)/t

Ft        = mv - mu

10x20 =  2(v) - m(0)

200/2 =  v

100m/s = v

                            ΔKE    = Work Done

           1/2mv² - 1/2mu²  = W

1/2(2)(100)²  -  1/2(2)(0)²  = W

                     10000 - 0  = W

                        10000J   = W

                             10kJ   = W

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