Question

an engine develops 10kw power. how much time it take to lift a mass of 200kg to a height of 40m?

Answer 1

Answer:

8 sec

Explanation:

GIVEN -

Power  = 10 Kw = 10000 watt

Mass = 200 kg

Height = 40 m

Time  = ?

As we know ,  power = workdone / time

workdone = force x displacement

force = mass x acceleration = 200x10 = 2000 N

workdone = 2000 x 40 = 80000 N/ $m^{2}$

TIME = WORKDONE/POWER

TIME = 80000/10000 =  8 SEC