Tuesday

September 2, 2014

September 2, 2014

Posted by **Physics** on Friday, January 29, 2010 at 10:30pm.

what time before rock hits ground.

the horizontal distance the rock traveled from base of cliff.?

my answer is 4.08 sec before rock hits ground

81.6 m distance traveled from base of cliff

- Gweedo8 -
**drwls**, Saturday, January 30, 2010 at 1:05amThe height of the rock above the base of the cliff is:

Y = 100 + 40 sin 42 t - 4.905 t^2

= 100 + 26.765 t - 4.905 t^2.

When t = 4.08, Y = 127 m

Your answer is incorrect.

Solve for t when Y = 0

Then multiply that time by 40 m/s*cos 42, the horizontal velocity component.

**Answer this Question**

**Related Questions**

Physics - A boy kicks a rock off a cliff with a speed of 19.4 m/s at an angle of...

Physics - A man stands on the roof of a 19.0 m-tall building and throws a rock ...

Physics - A man stands on the roof of a building that is 50 m tall and throws a ...

Physics - A man stands on the roof of a building that is 50 m tall and throws a ...

physics - a man stands on the roof of a building that is 30m tall and throws a ...

physics - A man stands on the roof of a 19.0 m-tall building and throws a rock ...

physics - a boy stands on a cliff overlooking a lake below. He throws a rock at ...

Physics - A man stands on the roof of a 19.0 m-tall building and throws a rock ...

math - Landon is standing in a hole that is 6.7 ft deep. He throws a rock and it...

physics - a man stands on the roof of a 15.0m tall building and throws a rock ...