List of top Physics Questions on work, energy and power asked in BHU UET

A body of mass 10 kg initially at rest acquires velocity $10 ms^{-1}$. What is the work done

When the bob of a simple pendulum swings, the work done by tension in the string is

A stationary particle explodes into two particles of masses $m_1$ and $m_2$ which move in opposite directions with velocities $v_1$ and $v_2$. The ratio of their kinetic energies $E_1 /E_2$ is

A body is initially at rest. It undergoes one dimensional motion with constant acceleration. The power delivered to it at time $t$ is proportional to

A machine which is 75% efficient, uses 12 J of energy in lifting 1 kg mass through a certain distance. The mass is then allowed to fall through the same distance. The velocity at the end of its fall is

A cylinder of mass $10 \,kg$ is rolling on a rough plane with a velocity of $10 \,m/s$. If the coefficient of friction between the surface and cylinder is $0.5$, then before stopping it will cover a distance of (Take $g = 10\, m/s^2$):

An object of mass $40\, kg$ and having a velocity $4\, m/s$ collides with another object $ \left( m=60\,kg \right) $ having velocity $2\, m/s$. The collision is perfectly inelastic. The loss in energy is:

A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by $ 1\,m/s $ , so as the have same kinetic energy as that of the boy. The original speed of the man is:

$ n $ small balls, each of mass $ m $ impinge elastically each second on a surface with a velocity $ u $ , then the force experienced by the surface in one second, will be: