Question

A force of 110N is applied horizontally to the handles of a lawnmower to move it at a speed of 0.80m/s across a lawn, Find the power used to mow the lawn.

Answer 1

P=Fv

Answer 2

P=110(0.8)=88W

Answer 3

since the force and the displacement are in the same direction, the work done is positive. Also Power=work/time. So P=f*d/t
P=f*v
P=110*0.8= 88 watt

Answer 4

a=v-u/t
10=0-0.8/t
t=0.8/10
t=0.08
p=workdone/time
p=110/0.08
p=110/0.08