Homework Help: physics

Posted by Taylor on Wednesday, September 21, 2011 at 4:26pm.

a rock is dropped from a height of 15m above the ground. when it hits the ground, it leaves a hole 12cm deep. what is the speed of the rock when it hits the ground? what is the deceleration of the rock when it hits the ground?

physics - Henry, Friday, September 23, 2011 at 11:25am
1. Vf^2 = Vo^2 + 2g*d,
Vf^2 = 0 + 19.6*15 = 294,
Vf = 17.15m/s.

2. a = (Vf^2 - Vo^2) / 2d,
a = (0 - (17.15)^2) / 24 = -12.26s.
physics - Henry, Friday, September 23, 2011 at 11:32am
Correction: a = -12.26m/s^2.

Answer this Question

Related Questions

physics - a rock is dropped from a height of 15m above the ground. when it hits ...
Calculus - well i have this homework question that says: A rock is dropped from ...
Physics - A boy kicks a rock off a cliff with a speed of 19.4 m/s at an angle of...
Physics - If a rock is dropped from a height of 64 feet, how long does it take ...
PHISIC help - A bouncy rubber ball is dropped from a height of about a metre ...
Calculus - Here is my problem that I am trying to work on: A rock is dropped ...
Physics - A sandbag is dropped from the helicopter 125 m above the ground. What ...
physics - a .140 kg baseball is dropped from rest from a height of 2.2m above ...
physics - a .140 kg baseball is dropped from rest from a height of 2.2m above ...
pre calc - A rock is dropped form the top of a cliff. It takes 12 seconds to hit...

For Further Reading

First Name:
School Subject:
Answer: