CPM Homework Help : CALC Problem 5-29

Kwok is standing on top of a 160-foot building and throws a tennis ball straight up with an initial velocity of 24 ft/sec. Homework Help ✎
1. How far up does the tennis ball go before it turns around and starts to come down?
2. How fast is it going when it hits the ground below?

Hint :

h(t) = −16t² + v₀t + s₀

Hint (a):

The tennis ball turns around when v(t) = 0.

Hint (b):

Evaluate v(time of impact). Let h(t) = 0 to find the time of impact.