A metre rule

A smooth sphere is moving on a horizontal surface with velocity vector 2i +2j ​ immediately before it hits a vertical wall. The wall is parallel to j ​ vector and the coefficient of restitution between the sphere and the wall is e=1/2. The velocity vector of the sphere after it hits the wall is [...]

A boy of mass 60 kg is standing over a platform of mass 40 kg placed over a smooth horizontal surface. He throws a stone of mass 1 kg with velocity v=10 m/s at an angle 450 with respect to the ground.Find the displacement of the platform (with boy) on the horizontal surface when the [...]

Two blocks of masses 2kg and 1kg respectively are tied to the ends of a string which passes over a light frictionless pulley. The masses are held at rest at the same horizontal level and then released. The distance traversed by the centre of mass in 2s is : (g=10m/s2) A metre rule weighing 100 [...]

Two billiard balls of same size and mass are in contact on a billiard table. A third ball of same mass and size strikes them symmetrically and remains at rest after the impact. Find the coefficient of restitution between the balls is A metre rule weighing 100 g rests on a table with a part [...]

A metre rule, weighing 100 g rests on a table with a part projecting over the edge. the length of the part projecting out if a 5 g body hung at the end just tills the rule is . A metre rule weighing 100 g rests on a table with a part projecting over the [...]