A worker can lift a 75-kg block directly off the ground on to a loading dock, or can push the block up a friction less incline from the ground to the loading dock. Lifting the block requires 680 J of work to be done. Pushing the block up the incline requires a minimum applied force of 320 N. Find the angle the incline makes with the horizontal.

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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