What is kinetic energy of a toy car that has a mass of 2 kg moving at a speed of 8 m/s?

Acricket ball of 70g moving with a velocity of 0.5 m/s is stopped by a player in 0.5s what is the force applied to stop the ball

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.