A block released from rest from the top of a smooth inclined plane of inclination 45 takes time t to reach the bottom. The same block released from rest from top of a rough inclined plane of the same inclination takes time 2t to reach the botttom. The coefficient of friction is :

a)0.75(answer), b)0.5, c)0.25, d)0.4, e)0.33, How do you get this answer?

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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