A car with a mass of 1200 kg at the top of a 42 m high hill. How much pontential energy does it have?

Will you chech and finish these for me, because i am stumped with them.

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

Agroup of monkeys is trying to cross the river in a rowboat. the maximum buoyant force on the rowboat is 2,000 n. the weight of the rowboat is 1,000 n. each monkey has a weight of 150 n. how many monkeys can safely cross in the rowboat at one time? explain your reasoning, including any calculations you used to find the answer.