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a young weightlifter raises a weight from a height of 0.6 m to a height of 1.3 m in a time of 3.2 seconds. his applied force has put out an average power of 43 w. if the weight does not accelerate at all in the process, what must be its mass?



Answer :

The mass is 20.038 Kg.

Mass is the amount of count in a physical body. it's also a degree of the frame's inertia, the resistance to acceleration while a net pressure is carried out. An item's mass additionally determines the power of its gravitational attraction to different bodies. The SI base unit of mass is the kilogram.

F = mg

Displacement of weight = h

                                          = 0.7 m

work done by weight lifter W = F × h  

W = (mgh)

     = 0.7mg

work done in 3.2 seconds

power P = W/Δt = 0.7 mg/3.2

Given,

P = 43 W = 43 J/s

⇒ 0.7 mg/3.2 = 43 j/s

⇒ M = (43 × 3.2)/(0.7 × 9.8)

M = 20.038 Kg ans.

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