145lbs*1kg/2.2lbs=xxxxkg,figure that out.
power=work/time=massinKg*9.8N/kg*4.8m /5.5sec in joules...
A 145-lb student races up stairs with a vertical height of 4.8 m in 5.5 s to get to a class on the second floor. How much power in watts does the student expend in doing work against gravity
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