An 81 kg football player moving 6.5 m/s tackles and collides with a stationary 140 kg football player. what speed will the football players have the moment after impact?

Aray diagram for a refracted light day is shown. what does the dashed line represent

What is a subatomic particle with a negative charge and very little mass?

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.)