$A$ $1 \, kg$ mass has a kinetic energy of $1 \, J$ when its speed is: (in $, m/s$)

When a ball is thrown vertically upwards,its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?

$A$ person is climbing a palm tree:
$(i)$ What is the work done against the force of gravity?
$(ii)$ What is the work done by the force applied by the person if the person climbs $10 \, m$ and the mass of the person is $45 \, kg$?

Calculate the kinetic energy of a car of mass $750\, kg$ moving with a velocity of $54\, km h^{-1}$. Find the new kinetic energy of the car if a passenger of mass $50\, kg$ sits in the car.

When a force retards the motion of a body,the work done is:

What is horsepower?