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ICSE Class 9 Answered

A weightlifter lifts a weight of 10 kg weight in 10 seconds. Calculate the change in the momentum of the weight (g = 9.8 ms
Asked by 7039_parth | 08 Jul, 2021, 01:30: PM
Expert Answer
Force is defined as rate of change of momentum
 
begin mathsize 14px style fraction numerator d left parenthesis m v right parenthesis over denominator d t end fraction space equals space F end style
where m is mass , v is velocity,  F is force and t is time
 
Hence change in momentum , d(mv) = F dt
 
To lift the 10 kg mass, minimum required force = 10 × 9.8 = 98 N
 
Since the force is applied for 10 s , change in momentum = 98 × 10 = 980 kg m/s
 

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