# physic

posted by .

What is kinetic energy after collision of mass 4kg moving 6m/s in +y direction collids and stick to another object with mass 2kg moving at 4m/s in +x direction.

• physic -

First apply conservation of momentum to get the final velocity V of the stuck-together masses. It will have both x and y components

The x-component of the final velocity is Vx = 2*4/(M1+M2) = 8/6 = 1.333 m/s

The y-component of the final velocity is
Vy = 4*6/(M1+M2) = 42/6 = 4.000 m/s

The final KE is (1/2)(M1+M2)V^2
= (1/2)(M1+M2)(Vx^2 + Vy^2)
= 53.33 J

(Note that the initial KE was 72 + 16 = 88 J)

## Similar Questions

1. ### physics

A 5.0 kg object moving in the +x direction at 5.5 m/s collides head-on with a 3.1 kg object moving in the -x direction at 4.0 m/s. Find the final velocity of each mass for each of the following situations. (Take the positive direction …
2. ### Physics

an object of mass 3 kg is moving in the positive x-direction with a speed of 10 m/s. A second object of mass 5 kg is moving in the northwest direction with a speed of 8 m/s. If the two stick together after the collision, what is the …
3. ### Physics -Conservation of Momentum-

1) A 1 kg mass moving at 1 m/s has a totally inelastic collision with a 0.7 kg mass. What is the speed of the resulting combined mass after the collision?
4. ### Physics -Conservation of Momentum-

1) A 1 kg mass moving at 1 m/s has a totally inelastic collision with a 0.7 kg mass. What is the speed of the resulting combined mass after the collision?
5. ### Physics ~really need help!~

1) A 1 kg mass moving at 1 m/s has a totally inelastic collision with a 0.7 kg mass. What is the speed of the resulting combined mass after the collision?
6. ### physics

2.)A 16 g mass is moving in the +x direction at 30 cm/s while a 4 g mass is moving in the -x direction at 50 cm/s. They collide head on and stick together. Find their velocity after the collision
7. ### Physics

16-g mass is moving in the +x direction at 30 cm/s while a 4-g mass is moving in the -x direction at 50 cm/s. they collide head on and stick together. find their velocity after the collision.
8. ### physics

16-g mass is moving in the +x direction at 30 cm/s while a 4-g mass is moving in the -x direction at 50 cm/s. they collide head on and stick together. find their velocity after the collision.
9. ### Physics

A 16-g mass is moving in +x direction at 30 cm/s while a 4-g mass is moving in the -x direction at 50 cm/s. they collide head-on and stick together. Find their velocity after collision?
10. ### Physics 1 Collision Math

Mass A, 2.0kg , is moving with an initial velocity of 7 m/s in the +x-direction, and it collides with mass B,4.0kg , initially moving in the +x-direction. After the collision, the two objects stick together and move as one. What is …

More Similar Questions