# Physics

posted by Kyle

If you drop a 1.0 kg weight from a height of 1.0 m, how many joules of kinetic energy will it have when it reaches the ground?

Can I use the equation for work: W = F*s to find the kinetic energy?
Or would I have to find the velocity of the weight as it falls because I'm not sure how to do that.

1. drwls

You can do it either way.
The work done (by gravity) is
M*g*H = 9.8 Joules
That equals the final kinetic energy.

Vfinal = sqrt(2 g H)
(1/2)M*Vfinal^2 = M g H

2. ty

48.02J

## Similar Questions

1. ### Physics

You drop a 2 kg textbook to a friend who stands on the ground 10m below the testbook with outstreatched hands 1.5m above the ground. a) how much work W_g is done on the textbook by the gravitational force as it drops to your friend's …
2. ### Physics

A 3.9-kilogram block sliding down a ramp from a height of 5.2 meters above the ground reaches the ground with a kinetic energy of 36 joules. The total work done by friction on the block as it slides down the ramp is approximately
3. ### Physics

A 3.6-kilogram block sliding down a ramp from a height of 4.6 meters above the ground reaches the ground with a kinetic energy of 37 joules. The total work done by friction on the block as it slides down the ramp is approximately: …
4. ### PHYSICS!

A 3.6-kilogram block sliding down a ramp from a height of 4.6 meters above the ground reaches the ground with a kinetic energy of 37 joules. The total work done by friction on the block as it slides down the ramp is approximately: …
5. ### Physics

A 4.2-kilogram block sliding down a ramp from a height of 4.5 meters above the ground reaches the ground with a kinetic energy of 33 joules. The total work done by friction on the block as it slides down the ramp is approximately:
6. ### physics

A 3.3-kilogram block sliding down a ramp from a height of 4.5 meters above the ground reaches the ground with a kinetic energy of 35 joules. The total work done by friction on the block as it slides down the ramp is approximately: …
7. ### physics

In compressed state, a spring 3.00 meters long hanging from the ceiling has a potential energy of 2.0 joules. If the entire potential energy is used to release a ball of mass 1.2 kilograms vertically downward, then what is the kinetic …
8. ### Physics

at the moment when a shot putter releases a 4kg shot the shot is 1.25 m above the ground and travelling at 7 m/s. it reaches a maxium height of 3.7 m above the ground and then falls to the ground. air resistance is negligible and the …
9. ### physics

A boulder with a mass of 48.3kg is sitting on the top of a 11.8m tall cliff, and the boulder falls off of the cliff. At what height above the ground is the boulder when it reaches a velocity of 6.40m/s?
10. ### Science

A man drop a stone of mass 2kg room the top of a building of height 15m when it reaches the ground find its kinetic energy.

More Similar Questions