compute the power required by a man to move a 10kg mass so as to change the speed of mass from 10m/s and 20m/s.
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Mass, m = 10 kg
Initial velocity, u = 10 m / s
Final velocity, v = 20 m / s
⇒ 1 / 2 x m x [v²-u²]
Calculations
1 / 2 x 10 x [(20)²-(10)²]
= 5 x (400 - 100)
= 5 x 300
= 1500 J
Power, P = Work done / Time consumed
= 1500 J / 5 s
= 300 J / s or W
Hence, the power required by a man to move a 10 kg mass so as to change the speed of mass from 10 m / s to 20 m / s in 5 seconds is 300 J / s or W.
Mass, m = 10 kg
Initial velocity, u = 10 m / s
Final velocity, v = 20 m / s
⇒ 1 / 2 x m x [v²-u²]
Calculations
1 / 2 x 10 x [(20)²-(10)²]
= 5 x (400 - 100)
= 5 x 300
= 1500 J
Power, P = Work done / Time consumed
= 1500 J / 5 s
= 300 J / s or W
Hence, the power required by a man to move a 10 kg mass so as to change the speed of mass from 10 m / s to 20 m / s in 5 seconds is 300 J / s or W.
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