On planet X a spring balance shows a reading of 120N when a block of mass 12kg is suspended from it.
(i) Determine the value of the acceleration due to gravity gX on planet X.
(ii) The same block is released from rest from the top of a 45m high tower on planet X. Calculate the time it takes to reach the ground.
(iii) Find the velocity with which the block strikes the ground.
(iv) If the value of g on another planet Y were exactly double that on planet X, what would be the weight of the same block on planet Y? (State your answer with proper unit.)