A ball moving with momentum of `5kgms^-1`strikes against a wall at an angle `45^@` and is reflected at the same angle. Calculate the change in momentum.

A ball moving with a speed of 9m.s strikes an identical ball at rest, such that direction fo eahc ball makes an angle 30^@ with the original line. Find the speed of two ball after collision.

A hockey ball of mass 200 g travelling at 10 m s^-1 is struck by a hockey stick so as to return it along its original path with a velocity at 5m s^1 . Calculate the change of momentum occured in the motion of hockey ball by the force applied by the hockey stick.

A ball of mass m moving with a constant velocity strikes against a ball of same mass at rest.If e is the co-efficient if restitution what will be the ratio of velocity of two balls after collision?

A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km/h. Its velocity is slowed down to 18 km/h in 4 s by an unbalanced external force. Calculate the acceleration and change in momentum. Also calculate the magnitude of the force required.

An aeroplane flying horizontally at a height of 1.5 km above the ground is observed at a certain point on the earth to subtend an angle 60°. After 15 second its angle of elevation is observed to be 30°. Calculate the speed of aeroplane in Km/h.

A electron and proton possesing equal momentum and injected to a region at right angle to a uniform magnetic field. Calculate the ratio of this radius while moving inside the magnetic field.

A molecule in a gas container hits a horizontal wall with speed 200 m s-^1 and angle 30^@ with the normal, and rebounds with the same speed. Is momentum conserved in the collision? Is the collision elastic or inelastic?

X-rays of wavelength 1.54 A ∘ strike a crystal and are observed to be deflected at a angle of '22.5overset(@)' . Assuming that n=1, calculate the spacing between the planes of atoms that are responsible for this reflection.

A ladder is kept standing at a slanting position against a wall of a house and in this position the base of the ladder is at a distance of 9.5m from the wall.If the ladder makes an angle of 60^@ with the ground level,find the length of the ladder.