# physical science 101

posted by .

A bullet is fired horizontally from a rifle at 300m/s from a cliff above a plain below. The bullter reaches the plain 6s later. (a) How high was the cliff? (b) How far from the cliff did the bullet reach the plain? (c) What was the bullet's speed when it reached the plain?

• physical science 101 -

(a) How far can a body fall in 6 seconds? That will be the height, H, since the in initial vertical velocity component is zero.

(b) (Horizontal velocity componet) * 6 seconds

(c) Kinetic energy (1/2) M V^2 will have increased by M g H

V^2 therefore increases by 2 g H from the initial value. You don't need to know M

## Similar Questions

1. ### Physics

a diver running 1.6m/s dives out horizontally from the edge of a vertical cliff and reaches the water below 3.0s later. how high was the cliff and how far from its base did the driver hit the water?
2. ### physics

A rifle bullet is fired from the top of a cliff at an angle of 30o below the horizontal. The initial velocity of the bullet is 800 m/s. If the cliff is 80 m high, how far does it travel horizontally?
3. ### physics

A diver running 2.4 m/s dives out horizontally from the edge of a vertical cliff and 2.6 s later reaches the water below. How high was the cliff?
4. ### Physics

A diver running 1.69 m/s dives out horizontally from the edge of a vertical cliff and 3.11 s later reaches the water below. How high was the cliff, and how far from the base did the diver hit the water?
5. ### physics

A cannon on a level plain is aimed 50 degrees above th e horizontal and a shell is fired with a muzzle velocity of 1200 ft/s toward a vertical cliff 3200 ft away. How far above the bottom does the shell strike the side wall of the …
6. ### Physics

A diver running 1.1 m/s dives out horizontally from the edge of a vertical cliff and 3.3 s later reaches the water below. How high was the cliff?
7. ### Physics 124

A projectile is fired from the top of a cliff at 14.2 m/s at an angle of 36.9 degrees below the horizontal, and strikes water at the same level as the base of the cliff 3.51 seconds later. (Assume g=10.0 m/s2.) How high was the top …
8. ### physics

A rifle bullet is fired at an angle of 28.3° below the horizontal with an initial velocity of 177 m/s from the top of a cliff 52.2 m high. How far from the base of the cliff does it strike the level ground below?
9. ### physics

A diver running 1.89 m/s dives out horizontally from the edge of a vertical cliff and 2.88 s later reaches the water below. How high was the cliff. (in m)
10. ### Physics

a bullet is fired horizontally from the top of a cliff that is 15 m above a long lake. if the muzzle speed is 478, how far from the bottom of the cliff does the bullet strike the surface of the lake

More Similar Questions

Post a New Question