When a person does work on an object, the object gains energy. as a bicycle rider rides from the bottom of a hill up a hill, the energy from the work being can become which combination of types of energy. a)the riders work becomes kinetic energy only. b)the riders work becomes a combination of kinetic energy and heat  c)the riders work becomes a combination of gravitational potential and heat   d)the riders work becomes a combination of gravitational potential, kinetic energy and heat

The cheetah is considered the fastest running animal in the world. cheetahs can accelerate to a speed of 20.1 m/s in 2.50 s and can continue to accelerate to reach a top speed of 28.1 m/s. assume the acceleration is constant until the top speed is reached and is zero thereafter.1) starting from a crouched position, how long does it take a cheetah to reach its top speed? (express your answer to three significant figures.) s2) how far does it travel in that time? (express your answer to three significant figures.) m3) if a cheetah sees a rabbit 120 m away, how long will it take to reach the rabbit, assuming the rabbit does not move? (express your answer to three significant figures.)