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The power of an engine is 30 kW. Time ta...

The power of an engine is 30 kW. Time taken by it in lifting a 150 kg body upto a 50 m height is ( `g = 9.8" m/s"^2` )

A

2.45 s

B

4.25 s

C

24.5 s

D

0.245 s

Text Solution

Verified by Experts

The correct Answer is:
A
The power of engine, `P = 30" kW" = 30 xx 1000" W"`
Mass, `m = 150` kg
`h = 50` m
`because P = ( mgh)/(t)`
`therefore t = (mgh)/( P) = (150 xx 9.8 xx 50)/( 30 xx 1000) = 2.45` s
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