Question

An engine develops 10 kW of power. How much time will it take to lift the mass of 200 kg to a height of 40 m. (Take g = 10 m s⁻¹ ) *

(a) 4 s

(b) 6 s

(c) 8 s

(d) 10 s​

Answer 1

Answer:

c

Explanation:

because option c is correct

Answer 2

Given : An engine develops 10 kW of power.

g  = 10  m/s²

To Find  : How much time will it take to lift the mass of 200 kg to a height of 40 m.

Solution:

lift the mass of 200 kg to a height of 40 m.

m = 200 kg

h  = 40 m

g  = 10  m/s²

Work to be done = mgh

= 200 * 10 * 40

= 80 kN

Power = 10 kW

power = work done / time

=> 10 kW  = 80 kN / Time

=> Time  = 8 sec

option c is correct answer

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