# Physics

posted by .

an anchor shoots an arrow into a piece of wood. the arrow is traveling at 120 km/h when it strikes the wood. the arrow penetrates 3.8 cm into the wood before stopping. what is the average acceleration (in m/s^2) into the wood?

• Physics -

first convert 120 km/hr into m/s
120 km/hr(1000 m/km)(1 hr /3600 s) = 33.3 m/s
It drops from 120 to zero so during the stop it averaged 33.3/2 m/s = 16.65 /s SPEED
it went .038 meters at average speed of 16.65 so it took .038 m /16.65 m/s = .00228 seconds to stop.
so change in speed/change in time = (0 - 33.3) / .00228
= -14605 m/s^2

## Similar Questions

1. ### Physics

An arrow is fired with a speed of 20.0 m/s at a block of Styrofoam resting on a smooth surface. The arrow penetrates a certain distance into the block before coming to rest relative to it. During this process the arrow's deceleration …
2. ### Physics

***EXTRA CREDIT*** An arrow is fired with a speed of 20.0 m/s at a block of Styrofoam resting on a smooth surface. The arrow penetrates a certain distance into the block before coming to rest relative to it. During this process the …

An arrow is fired with a speed of 20.0 m/s at a block of Styrofoam resting on a smooth surface. The arrow penetrates a certain distance into the block before coming to rest relative to it. During this process the arrow's deceleration …
4. ### Physics

An archer shoots an arrow into a piece of wood. The arrow is traveling at 120 km/h when it strikes the wood. The arrow penetrates 3.8 cm into the wood before stopping. What is its average acceleration (in m/s2) into the wood?
5. ### Science

A 0.05 kg arrow with the velocity of 180 m/s is used to shoot a 5 kg block of wood off the top of a log. What will be the velocity of the arrow and wood after contact?
6. ### Physics

Mr. Anderson shoots an arrow straight up into the air. The arrow leaves her bow at 1.2[m] above ground, and reaches a height of 95 feet above ground. It then falls down and penetrates 14 inches into the ground. Find: a) The velocity …
7. ### Physics!

Ms. Anderson shoots an arrow straight up into the air. The arrow leaves her bow at 1.2[m] above ground, and reaches a height of 95 feet above ground. It then falls down and penetrates 14 inches into the ground. Find: a) The velocity …
8. ### PHYSICS

Ms. Anderson shoots an arrow straight up into the air. The arrow leaves her bow at 1.2[m] above ground, and reaches a height of 95 feet above ground. It then falls down and penetrates 14 inches into the ground. Find: a) The velocity …
9. ### Physic

If a 35 g arrow moving at 160 km/h penetrates a block of wood suspended by a rope, what impulse is delivered to the block?
10. ### physics

an archer shoots an arrow into a piece of wood. the arrow is traveling at 120km/h when it strikes the wood. the arrow penetrates 3.8cm into the wood before stopping. what is its average acceleration (in m/s squared) into the wood?

More Similar Questions