Question

How much time does it take for a man to push a wheelbarrow across a 10m yard when he is applying 15N and producing 30W?

Answer 1

Answer:5 seconds

Step-by-step explanation:

Power=30w

Force=15N

Distance=10m

Time=?

Power=(force x distance)/time

30=(15 x 10)/time

time=(15 x 10)/30

time=150/30

time=5

time=5 seconds

Answer 2

The time taken is 5 s

Step-by-step explanation:

The force applied by the man is 15 N to push the wheel through 10 m

Thus the work done by him = Force x distance

= 15 x 10 = 150 J

The time taken can be found by the relation = t =
`(Work)/(Power)`

Therefore t =
`(150)/(30)` = 5 s