Two equal masses m₁ and m₂ moving along the same straight line with velocities +3 m/s and -5 m/s respectively collide elastically. Their velocities after the collision will be respectively _______________.

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particles takes place in a plane. It follows that ___________.

Power can be expressed as ______________.

A shell, in flight explodes into four unequal parts. Which is conserved?

Two bodies of masses m and 4m are moving with equal kinetic energies. The ratio of their linear momenta is _____________.

A gun of mass M fires a bullet of mass m with maximum speed v. G.T. m < M. The kinetic energy of the gun will be ______________.

A ball whose Kinetic Energy is E is projected at an angle of 45° to the horizontal. The kinetic energy of the ball at the highest point of its flight will be _____________.

A simple pendulum hanging freely and at rest vertical because in that position ______________.

A boy is carrying a school bag of 5 kg mass on his back and moves 100 m on a levelled road. The work done against the gravitational force is ____________ (g = 10 ms^-1)

When a body falls freely towards the earth, then its T.E. ______________.

Which one of the following is not the unit of energy?

A ball bounces to 75% of its original height. Calculate the mechanical energy lost in each bounce _________________.

A particle moves along x-axis from x = 0 to x = 7m under the influence of a force given by f(x) = 12-2x+3x² then the work done is__________________

A cricket ball falls from a height of 40 m. What is the velocity with which the ball hits the ground?

A spring of force constant k is cut into two pieces such that one piece is double the length of the other. Then, the long piece will have a force constant of

If the potential energy of the particle is \(\alpha -\frac { \beta }{ 2 } { x }^{ 2 }\), then force experienced by the particle is

The work done by the conservative force for a closed path is

The coefficient of restitution e for a perfectly elastic collision is ______________.

A body of mass 1 kg is thrown upwards with a velocity 20 ms^-1. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction?(Take g = 10 ms^-2)

A uniform force of (2\(\hat { i }\)+\(\hat { j }\)) N acts on a particle of mass 1 kg. The particle displaces from position (3\(\hat { j }\)+\(\hat { k }\)) m to (5\(\hat { i }\)+3\(\hat { j }\)) m. The work done by the force on the particle is