Topic: The height s above the ground at time t of an object is given by s(t) = -5t2 + vot + so where s is in meters, t is in seconds, v0 is the object's initial velocity in meters per second and s0 is its initial position in meters. a) If you throw a ball straight up from the ground with an initial velocity of 20 meters per second, how long will it take for the ball to hit the ground? Explain your reasoning. b) If you now throw the ball from the top of a tower which is 80 meters above ground, at the same initial velocity as in part a), when does it hit the ground? Explain your reasoning.

Idon’t quite understand this problem

Write a polynomial function with the given zeros x= -1,0,2show your work

Atennis player used a tennis racket to hit a tennis ball with a mass of 0.25 kg with a force of 5.25 newtons. how does the force the tennis racket exerted on the tennis ball compare with the force the tennis ball exerted on the tennis racket? a. the force of the tennis racket on the tennis ball is equal in magnitude and opposite in direction to the force the tennis ball exerted on the tennis racket. b. the force of the tennis racket on the tennis ball is equal in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. c. the force of the tennis racket on the tennis ball is less in magnitude and in the same direction as the force the tennis ball exerted on the tennis racket. d. the force of the tennis racket on the tennis ball is greater in magnitude and opposite in direction as the force the tennis ball exerted on the tennis racket.