Calculate the height?

Question

through a crane can lift a load of 4t when its motor of 4HP operater for 10s

Answer 1

1hp is 746 W and g = 9.8 m/s^2

But in other questions, you have assumed rounded values

1 hp = 750 W and g = 10 m/s^2

Here I am assuming the same values, which you have assumed in your other questions.

1 ton = 1000 kg

Mass m = 4t = 4000 kg

Power P = 4 HP = 4 * 750 W = 3000 W

Time t = 10s

Height h = ?

Work done W = mgh = 4000 * 10 * h

P = W/t

Or, 3000 = 4000 * 10 * h/10

Or, 3000 = 4000 * h

Or, h = 3000/4000 m = 3/4 m = 0.75 m

Ans: 0.75 m i.e. 75 cm

Answer 2

i am con-FUSED!!