Posted by **Kim-lee** on Wednesday, September 17, 2008 at 10:57pm.

it is a projectile motion question i just can't seem to figure out

A ball is shot from the ground into the air. At a height of 9.1 m, its velocity is observed to be v = 7.6i + 6.1j m/s

To what maximum height does the ball reach?

the answer is suppose to be 11m

- wow...Phys...this has me COMPLETELY clueless -
**drwls**, Wednesday, September 17, 2008 at 11:40pm
The vector velocity component that goes with the "j" unit vector is the vertical component. At 9.1 m height, the ball will rise until the vertical component becomes zero. That additional height H can be obtained from energy considerations:

g H = (1/2)(6.1 m/s)^2

which tells you that

H = 1.9 m

Add that to 9.1 m for the answer.

## Answer this Question

## Related Questions

- Physics - Q Exactly 2.7s after a projectile is fired into the air from the ...
- Physics (projectile motion) - Projectile fired in earths gravitational field at ...
- physics/ 2D motion - A projectile of mass 0.539 kg is shot from a cannon. The ...
- Physics - A ball is shot from the ground into the air. At a height of 0.1m, the ...
- Pre-Calculus - Hello, A projectile is launched straight up from the ground with ...
- Physics - A ball is shot from the ground into the air. At a height of 9.1 m, the...
- Physics 11U - At the moment when a shot putter releases a 5.00 kg shot, the shot...
- Physics - A projectile mass of 0.500 kg is shot straight up with an initial ...
- calculus - The height of a projectile launched into the air is given by h (t)= -...
- Math(Please help) - Projectile motion: Let's suppose you throw a ball straight ...