A 4kg soccer ball sits on the ground.A boy comes up and kicks the ball 24m. If the work done was 78j,what was the balls velocity. I really need help :/
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Ответ:
P= 783.6 W
Explanation:
Given that
Total mass M= 1250 Kg
d= 53 m ,in time t= 3.1 min
Counter weight mass ,m = 975 kg
The total net force F
F= M g - m g
F= (1250 - 975 ) x 10 N ( take g =10 m/s²)
F=2750 N
We know that work done by force F
W= F. d
W= 2750 x 53 J
W=145750 J
The power P is the rate of change of work with time .
P= 783.6 W