Collision and Kinetic Energy Problem

So, by the time they stick together, the final velocity of the combined mass will be 2.07 m/s at an angle of 50.1˚ south of west. The total kinetic energy lost in this inelastic collision will be 12.4 Joules. In summary, two balls with masses of 2.50 kg and 1.20 kg, moving at velocities of 8.00 m/s and 4.75 m/s at angles of 25.0˚ south of west and 61.0˚ north of west, respectively, collide and stick together to form one mass. The final velocity of the combined mass is 2.07 m/s at an angle of 50.
  • #1
njuice8
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0
A ball, which has a mass of m1 = 2.50 kg., is moving with a velocity of 8.00 m/s at an angle of 25.0˚ South of West. It collides with a second ball, which has a mass of m1 = 1.20 kg., which is moving with a velocity of 4.75 m/s at an angle of 61.0˚ North of West. They stick together and move as one.
What will be the final velocity v3 of the balls after the collision?
How much kinetic energy was lost in this inelastic collision?

I attached a picture of my work
I'm not sure if my work is right.

Also, for the kinetic part, would I just use (1/2)mv^2 = (1/2)mv^2 - Wnc?

Thanks!
 

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  • #2
Overall, looks good. But I think you dropped out the factor of 3.7 during the calculation of the y-component which has thrown off your answer for the angle. Also, it's a good idea to state your angle clearly in terms of "south of east" or whatever.
 
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FAQ: Collision and Kinetic Energy Problem

What is collision and kinetic energy problem?

Collision and kinetic energy problem is a type of physics problem that involves analyzing the motion of objects before and after a collision. It focuses on the transfer of kinetic energy between objects during a collision.

What is the equation for calculating kinetic energy?

The equation for calculating kinetic energy is KE = 1/2 mv^2, where KE is kinetic energy, m is mass, and v is velocity.

How is kinetic energy related to collisions?

In collisions, kinetic energy is transferred between objects. The total kinetic energy before a collision is equal to the total kinetic energy after the collision, assuming there are no external forces acting on the system.

How is momentum related to collisions?

Momentum is also conserved in collisions, just like kinetic energy. The total momentum before a collision is equal to the total momentum after the collision, as long as there are no external forces acting on the system.

What is an inelastic collision?

An inelastic collision is a type of collision where kinetic energy is not conserved. This means that some of the kinetic energy is lost in the collision, usually due to the objects sticking together or deforming. In these types of collisions, the total kinetic energy after the collision is less than the total kinetic energy before the collision.

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