Quadratic Word Questions

Question

A rock is thrown upward with a velocity of 15 meters per second from the top of a 34 meter high cliff, it misses the cliff on the way back down. When will the rock be 5 meters from the water, below? Round the answer to two decimal places.

**Note**

Ithink I'm supposed to use the quadratic formula, but I'm not sure.

Answer 1

The formula you need for this problem is

s(t) = s₀ + v₀t - (1/2)gt²

where s(t) is the height above ground 0 (the water) at time t, s₀ is the initial height above ground 0, v₀ is the initial velocity and g is the acceleration due to gravity, 9.8m/sec/sec.

With that information you should be able to solve the problem...and yes, it wil give you a quadratic equaton.