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Anonymous

In physics it is shown that the

height s of a ball thrown straight up with an initial speed of

96 ft/sec from ground level is

where t is the elapsed time that the ball is in the air.

(a) When does the ball strike the ground? That is, how long

is the ball in the air? (b) What is the average speed of the ball from to

(c) What is the instantaneous speed of the ball at time t?

(d) What is the instantaneous speed of the ball at

(e) When is the instantaneous speed of the ball equal to

zero?

(f) How high is the ball when its instantaneous speed equals

zero?

(g) What is the instantaneous speed of the ball when it strikes

the ground?

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