Question

George pushes a wheelbarrow for a distance of 12 meters at a constant speed for 35 seconds by applying a force of 20 newtons. What is the power applied to push this wheelbarrow?

Answer 1

Since Power is equal to the product of Force and Displacement all over time, George needs 6.86 W of power to push the wheelbarrow. Power can also be calculated by multiplying Force applied on the object and the speed of the object being applied of the force.

Answer 2

Answer: 6.86 watt

Explanation: Power is the rate of doing work.

$Power=\frac{work}{time}$

A force is said to have done a work if it results in the displacement of an object in the direction of the force applied.

$Work=Force\times displacement=20N\times 12m=240Nm=240J$  

(1Nm=1Joule)

Thus $Power=\frac{240Nm}{35sec}=6.86Nms^{-1}= 6.86watt$

$(1Nms^{-1}=1Watt)$