Question

The time taken by an engine of power 10kw to lift a mass of 200kg to a height of 40m is (g=10m/s2)

Answer 1

time would be 8 seconds

Explanation:

• power=work done / time
• work done= force ×displacement

here,

W=-mgh

=80000

time = 80000/power

t=80000/10×1000

=8sec