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Work done against the gravity by taking  a 10kg block to height 1m in 1sec will be?here why we take external force equal to mg
Asked by ashutosharnold1998 | 28 Sep, 2019, 21:58: PM
answered-by-expert Expert Answer
workdone = Force × distance = mg × h = 10×9.8×1 = 98 J
 
m = mass of load, g = acceleration due to gravity, h = distance
 
power = Rate of workdone = 98 J / 1 s = 98 W
 
work is done to lift the 10 kg load against gravitational force . 
Gravitational force acting on a mass m is m×g
Answered by Thiyagarajan K | 29 Sep, 2019, 07:29: AM

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