Question

10 PTS!!! HELP!
Lifting a chair that weighs 4 kg to a height of 40 cm takes 16 J of energy.

a) What amount of energy would be needed to lift a similar chair to a height of 80 cm?

b) What amount of energy would be needed to lift a chair that weighs 2kg to a height of 40 cm?

Answer 1

a) To lift a similar chair to a height of 80 cm, you would need 32 joules.  
b) The amount of energy that would be needed to lift a chair that weighs 2kg to a height of 40 cm would be 8 joules. 

Answer 2

Answer for a = 32 j
Answer for b = 8 j