How to drive the formula of elastic collision by using V as final velocity and U as initial velocity

The diagram shows a person using a piece of gym equipment to lift weight which best describe the body in terms of simple machine

This punnett square shows the cross between two pants. one parent has round seeds (rr). and the other parent has wrinkled seeds (rr) which best describes their offspring as shown in this cross?

The combining of light nuclei is called blank. blank as in not actually blank. you know what im tryin to say.