An electric motor creates a tension of $4500 \, N$ in a hoisting cable and reels it in at the rate of $2 \, m/s$. What is the power of the electric motor?

$A$ force acts on a body of mass $15 \,kg$, initially at rest. If the instantaneous power due to the force at the end of the third second is $5 \,W$, then the instantaneous power (in $W$) at the end of the $4 \,s$ will be

Water falls from a waterfall onto the blades of a turbine at a rate of $100 \ kg/s$. If the height of the fall is $100 \ m$,what is the power generated by the turbine?

$A$ car of mass $1000 \ kg$ accelerates uniformly from rest to a velocity of $54 \ km/h$ in $5 \ s$. The average power of the engine during this period in watts is .............. $W$ (neglect friction).

An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of $2\, m/s$. The mass per unit length of water in the pipe is $100\, kg/m$. Calculate the power $W$ of the engine. (in $, W$)

$A$ particle is acted upon by a constant power. Then, which of the following physical quantity remains constant?