The broad tyes of a tractor `"_______"` pressure on the soft ground, and hence, prevent it from` "_________"` in the ground.

When a person jumps from a tree to the ground what happens to the momentum of the person upon striking the ground ?

A man whose mass is m kg jumps vertically into air from the sitting position in which his centre of mass is at a height h_(1) from the ground. When his feet are just about to leave the ground his centre of mass is at height h_(2) from the ground and finally centre of mass rises to h_(3) above the ground when he is at the top of the jump. what is the average upward force exerted by the ground on him?

A uniform rod kept vertically on the ground falls from rest. Its foot does not slip on the ground

A vertically straight tree, 15m high, is broken by the wind in such a way that its top just touches the ground and makes an angle of 60^@ with the ground. At what height from the ground did the tree break?

A ball of mass 10 g falls from a height of y 5 m. It rebounds from the ground to a height of 4m. Find : (a) the initial potential energy of the ball, (b) the kinetic energy of the ball just before the ground. striking the ground, (c) the kinetic energy of the ball after striking the ground ,and (d) the loss in kinetic energy on striking the ground . Take g=9.8 m s^(-2) .

A man of mass 80kg pushes box of mass 20kg horizontaly. The man moves the box with a constant acceleration of 2 m//s^(2) but his foot does not slip on the ground. There is no friction between the box and the ground. There is no friction between the box and the ground. whereas there is sufficient friction between the man's foot and the ground to prevent him from slipping. Assertion:- The force applied by the man on the box is equal and opposite to the force applied by the force applid by the box on the man. Reason:- Friction force applied by the ground on the man is 200N.

A particle is projected vertically upwards from a point A on the ground. It takes t_(1) time to reach a point B but it still continues to move up. If it takes further t_(2) time to reach the ground from point B then height of point B from the ground is :-

Martin wants to know how tall a certain flagpole is. Martin walks 10 meters from the flagpole, lies on the ground, and measures an angle of 70^@ from the ground to the base of the ball at the top of the flagpole. Approximately how tall is the flagpole from the ground to the base of the ball at the top of the flagpole?

When a hydrogen atom is raised from the ground state to an excited state

when a hydrogen atom is raised from the ground state to an excited state