please help! velocity

A cat drops from a shelf 3.9 ft above the floor and lands on all four feet. His legs bring him to a stop in a distance of 12 cm.

Part A:
Calculate his speed when he first touches the floor (ignore air resistance). Express your answer to two significant figures and include the appropriate units.

Part B:
Calculate how long it takes him to stop. Express your answer to two significant figures and include the appropriate units.

Part C:
Calculate his acceleration (assumed constant) while he is stopping, in m/s^2. Express your answer to two significant figures and include the appropriate units.

Part D:
Calculate his acceleration (assumed constant) while he is stopping, in g's. Express your answer to two significant figures.
Calculate