Question Answers

A boy of height 1.5 m, making move on a skateboard due east with velocity 4 m s^-1, throws a coin vertically up a velocity of 3 m s^-1 relative to himself. (a) Find the total displacement of the coin relative to ground till it comes to the hand of the boy. (b) What is [...]

An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other . The first part of mass 1kg moves with a speed of 12m/s^-1 and the second part of mass 2kg moves with 8m/s^-1. If the third part flies off with a velocity [...]

Two sphere A and B of masses m1​ and m2​ respectively collide. A is at rest initially and B is moving with velocity v along x-axis. After collision B has a velocity v/2​ in a direction perpendicular to the original direction. The mass A moves after collision in the direction. A bullet of mass 10g [...]

A ball is thrown from the top of a building 45 m high with a speed 20 m/s above the horizontal at an angle of 30. Find (a) The time taken by the ball to reach the ground. (b) The speed of ball just before it touches the ground. (b) location of the point of [...]

An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12ms^−1 and the second part of mass 2 kg moves with 8ms^−1 speed. If the third part flies off with [...]

A body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three pieces. Two pieces, each of mass (m) move perpendicular to each other with equal speeds (u). The total kinetic energy generated due to explosion is A body of mass (4m) is lying in x-y plane at rest. It [...]

A relief food package is dropped from a airplane which is moving horizontal with a velocity of 30 m s ^ −1 at a height h = 50 m. Find the (a) time of flight of the package, (b) location of the point of striking of the food package, (c) velocity of the package at [...]

The force ‘F’ acting on a particle of mass ‘m’ is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from zero to 8 s is question The force 'F' acting on a particle of mass 'm' is indicated by the force-time graph shown below. The [...]

a. With what velocity (v 0) should a ball be projected horizontally from the top of a tower so that the horizontal distance on the ground is ηH, where H the height of the tower? a. With what velocity (v 0) should a ball be projected horizontally from the top of a tower so that [...]

A bullet of mass 10g moving horizontally with a velocity of 400 m/s strikes a wood block of mass 2 kg which is suspended by a light inextensible string of length 5 m. As a result, the centre of gravity the block is found to rise a vertical distance of the block is found to [...]