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Questions in physics

[Done] A cheetah can run at approximately 100 km/hr, and a gazelle at 80 km/hr. If both animals are running at full speed, with the gazelle 70 meters ahead, how long will it take for the cheetah to catch its prey?

[Done] Can a light ray be both reflected and refracted at the same time?

[Done] A 2,000-kilogram car uses a braking force of 12,000 Newtons to stop in 5 seconds. What is the initial speed of the car?

[Done] Terry, a 70-kilogram tailback, runs through his offensive line at a speed of 7.0 m/s. Jared, a 100-kilogram linebacker, running in the opposite direction at 6.0 m/s, meets Terry head-on and "wraps him up." What is the result of this tackle?

[Done] Is there air resistance in space?

[Done] Can someone give me four examples of how energy has the ability to cause motion or create change?

[Done] What three variable factors determine the force of gravity between any two objects?

[Done] If the force of friction acting on the sliding crate is 100 N, how much force will be applied to maintain a constant velocity? What will the net force be acting on the crate? What will be the acceleration?

[Done] A golf club with 65 J of kinetic energy strikes a stationary golf ball with a mass of 46 g. The energy transfer is only 20% efficient. Calculate the initial speed of the golf ball.

[Done] If 478 watts of power are used in 14 seconds, how much work was done?