Answer to Question #86392 in Mechanics | Relativity for jagvir dhatt

Question

A man carries a load of 50 kg to a height of 15m in 5 minutes. Calculate A) the work done, B)the power extended

Answer 1

a) By the definition of the work, we have:

$$W = Fh = mgh = 50 kg \cdot 15 m \cdot 9.8 \dfrac{m}{s^2} = 7350 J.$$

b) We can find the power from the formula:

$$P = \dfrac{W}{t} = \dfrac{7350 J}{5 min \cdot \dfrac{60 s}{1 min}} = 24.5 W.$$

Answer:

a) $W = 7350 J.$

b) $P = 24.5 W.$