A 55.0-kg woman leaps vertically into the air from a crouching position in which her center of mass is 40.0 cm above the ground. As her feet leave the floor her center of mass is 90.0 cm above the ground and rises to 120 cm at the top of her leap. (a) What upward force, assumed constant, does the ground exert on her? (b) What maximum speed does she attain?

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

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