Question

If it takes 726 watts of power to move a mass 36 meters in 14 seconds, then what is the magnitude of the object’s mass?

A. 12. 1 kg

B. 20. 2 kg

C. 28. 8 kg

D. 282 kg

Answer 1

Answer: mass=28.8kg

Power , p =726 watt

displacement, d =36m

time ,t =14s

g=9.8m/s^2

p= (work)/t

p=(mg*d)/t

726=(m*9.8*36)/14

m= 28.8kg

Explanation: when a force causes displacement of the body , work is said to be done on the body. Power is the rate of doing work. Hence here power was applied on a body of certain mass which caused the given displacement of the body in given time.