# Math Help - Word Problem Help

1. ## Word Problem Help

Use a(t)= -32 feet per second squared as the acceleration due to gravity. A ball is thrown vertically upward from the ground with an initial velocity of 96 feet per second. How high will the ball go.

2. Originally Posted by ihatemath
Use a(t)= -32 feet per second squared as the acceleration due to gravity. A ball is thrown vertically upward from the ground with an initial velocity of 96 feet per second. How high will the ball go.
The velocity is $v(t)=\int a(t)dt=-32t+C$ where $C$ is the initial velocity. Therefore, the velocity function is:

$v(t)=-32t+96$

So now you have to find the point where $v(t)=0$, since this is the point where the ball is at the maximum hieght. Since the ball started at the ground, the initial position is $C_2=0$, so see if you can find the deduce the maximum height with this information. Just think about the relationship between velocity and position.

3. Is the answer 144 ft?