Wednesday

January 28, 2015

January 28, 2015

Posted by **Abbey** on Friday, April 16, 2010 at 3:07pm.

a) Find the equation that describes the motion as a function of time.

My answer was x = 0 and y=-16t^2+50t+6

b) How long is the ball in the air?

This is the part I need help on. Can I put the y equation into my graphing calculator to solve for t?

- Math -
**bobpursley**, Friday, April 16, 2010 at 3:13pmyou can, but it is not necessary.

when it returns to ground, y=0

0=-16t^2+50t+6

16t^2-50t-6=0

using the quadratic equation...

t= (50+-sqrt(2500+384)/32

t=(50+-sqrt 53.7)/32=103.7/32=3.24sec

Your graphing calc may have a subrouting to solve quadratic equations, many do.

check my work.

**Answer this Question**

**Related Questions**

Math(Please help) - Projectile motion: Let's suppose you throw a ball straight ...

math - Let’s suppose you throw a ball straight up with an initial speed of 50 ...

trig - Bob throws a ball straight up with an initial speed of 50 feet per second...

Pre Calc - Alice throws a ball straight up with an initial speed of 40 feet per ...

Pre calc - Alice throws a ball straight up with an initial speed of 40 feet per ...

Intermediate Algebra - If a projectile is fired straight upward from the ground ...

algebra - You throw a tennis ball up in the air from an initial height of 4 feet...

ap calculus - The height s of a ball, in feet, thrown with an initial velocity ...

algebra - The height in feet of a projectile with an initial velocity of 32 feet...

algebra - Patty is only 7 years old, but she insists she can play basketball ...