Had a kinetic energy of 1200 j , if missy’s mass is 40kg, then what is her speed

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

The charge on a charged sphere is; 1. concentrated at its center 2. distributed uniformly throughout its volume 3. clustered on its center 4. distributed uniformly over its surface