The acceleration of a particle as seen from two frames S1 & S2 have equal magnitude 4m/s^2.

(a) The frames must be at rest with respect to each other.

(b) The frames may be moving with respect to each other but neither should be accelerated with respect to each other.

(c) The acceleration of S2 with respect to S1 may either be 0 or 8m/s^2.

(d) The acceleration of S2 with respect to S1 may be anything between 0 and 8m/s^2.

THE ANSWER IS (d). BUT HOW IS THIS ?

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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