# physics (momentum)

A 3 kg ball with an initial velocity = (4.00i + 3.00j)m/s collides with a wall and rebound with a final velocity = (-4.00i + 3.00j)m/s. The ball is in contact with the wall for delta t =2.00E-3s. (specify answers with unit vectors)

a) what is the change in the ball's momentum? ans -24i + 0j

b)what is the impulse exerted on the ball by the wall?
ans mvf - mvi = 0 - (-24i) = 24 kgm/s (is this correct?)

c) what is the average force on the ball by the wall?

ans Favg = impulse/t
so: Favg = 24kgm/s / 2E-3 = 1.2E4 (newton?)

d) what is the average force on the wall by the ball?

??

What is your question? THe last part, is opposite sign to c).

so it appears, I was on the right direction? therefore both a) b) c) are correct and that for d) I'll have opposite negative response to C.

yes, they are all correct.

1. 👍 0
2. 👎 0
3. 👁 104

## Similar Questions

1. ### Physics

a 2.00 kg object has a velocity of 4.00i -3.00j m/s. What is the kinetic energy at this moment? What is the net work done on the object if its velocity change 6.00i +2.00j m/s

asked by Anonymous on March 21, 2015
2. ### Physics

A 0.500 kg sphere moving with a velocity (2.00i - 3.50j + 1.00k) m/s strikes another sphere of mass 1.50 kg moving with a velocity (-1.00i + 2.00j - 2.80k) m/s. (a) If the velocity of the 0.500 kg sphere after the collision is

3. ### science

m=-2.00i+6.00j-4k and n=2.00i-3.00j. what is the dot product of m and n?

asked by dineo on February 22, 2015
4. ### Physics

Two forces act on a 0.200 kg ant: F1 =(3.00i - 8.00j)N and F2=(5.00i + 3.00j)N. Express the net acceleration of the ant in unit vector notation. The resultant force is 8.00 i - 5.00 j Newtons. Divide that by the mass (0.2 kg) for

asked by Daniel on February 20, 2007
5. ### Re: Physics/Math

At time t1 = 2.00 s, the acceleration of a particle in counterclockwise circular motion is (9.00i + 8.00j) m/s^2. It moves at constant speed. At time t2 = 3.00s (3/4 of a revolution later), it's acceleration is (8.00i - 9.00j)

asked by COFFEE on February 18, 2007
6. ### Physics/Math

At time t1 = 2.00 s, the acceleration of a particle in counterclockwise circular motion is (9.00i + 8.00j) m/s^2. It moves at constant speed. At time t2 = 3.00s (3/4 of a revolution later), it's acceleration is (8.00i - 9.00j)

asked by COFFEE on February 18, 2007
7. ### General Physics

A 0.500 kg sphere moving with a velocity (2.00i - 3.50j + 1.00k) m/s strikes another sphere of mass 1.50 kg moving with a velocity (-1.00i + 2.00j - 2.80k) m/s. (a) If the velocity of the 0.500 kg sphere after the collision is

8. ### physics

Find a vector with a magnitude of 1.00 that bisects the angle between the vectors 5.00i + 11.0j and 2.00i − 1.00j. Give your answer in rectangular coordinates. Please explain how you arrived at the solution. Thanks!

asked by melissa on January 19, 2011
9. ### Physics

A 50g tennis ball is thrown with a velocity of 12 m/s. It strikes a wall and rebounds with a velocity of 10 m/s. a) What is the ball's initial and final momentum? b) what is the impulse on the ball? c) Thje ball is in contact with

asked by Jack on April 15, 2013
10. ### physics

A ball is kicked with an initial velocity of 20.0 m/s at an angle of 35 degrees to the ground. If it is to pass over a wall 5.6 m high determine a. The minimum horizontal the wall can be placed from the ball’s launch point in

asked by T on October 1, 2015

More Similar Questions