Question

A man exerts a force of 200 N in pulling a cart at a constant speed of 5 m/s. The power spent by man is

• A. $1.44kW$
• B. $2kW$
• C. $1kW$
• D. $0.5kW$

Answer 1

The correct option is C $1kW$

Force exerted by man, F= 200 N
Speed of cart, v = 5 m/s

$\text{Power =}F\times v=200\times 5watt=1000watt1kw=1000watt\Rightarrow \text{Power spent by man= 1 kW}$