A weightlifter lifts a barbell of mass 50 kg to a height of 2 m in 3 sec(take g=9.8m/s²​ a) What is the weight of the barbell?
b) What is the work done by the weightlifter?
c) Calculate the power developed by the weightlifter?

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

Energy can be transformed from one form to another. the diagram shows one such process. which energy transformation is represented in the diagram? nuclear to thermal and radiant nuclear to electrical and chemical chemical to nuclear and radiant chemical to electrical and nuclear

What are known as the properties of substances that describe a substance et does not change that substances?