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At a certain time interval, a lift of 400 kg moving varies its speed 4 m / s to 6 m / s. Determine the value of work in Joules, the force on the lift




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Work done is change in KE + change in PE
change in KE is 1/2 m (v^2 - u^2)
change in PE needs time interval or distance traveled :  m g height gained

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