Question

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An engine develops 10 kW of power. How much time will take to itt a mass of 200
height of 40 m (g = 10 m/s2)
(a) 4s
(b) 5s
(c) 8s
d 10s
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Answer 1

power =work done/time= 10kw=10000

s=ut+gt^2

40=0+1/2×50×t^2

5t^2=40

t^2=40/5=8 sec