Posted by **Cicilia** on Wednesday, January 25, 2012 at 8:03pm.

A 15 kg mass, moving east at 5 m/s, collides elastically with another 10 kg mass, moving west at 1 m/s. After the collision, the larger mass moves off with a velocity of 3 m/s. What is the final velocity of the smaller mass?

Is it 4m/s? Or would it be 2m/s?

Do you add the momentum of the 2 masses because of conservation of momentum or subtract them because they're going in different directions?

- Physics: Collison/Momentum Problem -
**bobpursley**, Wednesday, January 25, 2012 at 8:45pm
conservation of energy.

energy before= energy after

15*5^2+10*1^2=15*3^2+10*v^2

V^2= 1.5*25+1-1.5*9

v= 5m/s check the math.

- Physics: Collison/Momentum Problem -
**liliana**, Friday, April 27, 2012 at 9:35pm
A solenoid has a cross-sectional area of 5.80 10-4 m2, consists of 100 turns per meter, and carries a current of 0.6 A. A 10 turn coil is wrapped tightly around the circumference of the solenoid. The ends of the coil are connected to a 0.7 resistor. Suddenly, a switch is opened, and the current in the solenoid dies to zero in a time of 0.16 s. Find the average current induced in the coil.

## Answer This Question

## Related Questions

- Science - Two masses of 20 and 10 kg are moving in the same direction and one ...
- Physics -Conservation of Momentum- - 1) A 1 kg mass moving at 1 m/s has a ...
- Physics -Conservation of Momentum- - 1) A 1 kg mass moving at 1 m/s has a ...
- Physics - A glass ball, ball A, of mass 6.0 g moves at a velocity of 19.0 cm/s. ...
- Physics ~really need help!~ - 1) A 1 kg mass moving at 1 m/s has a totally ...
- PHYSICS (most is worked) - A glass ball, ball A, of mass 6.0 g moves at a ...
- PHYSICS!! - I've tried this problem again and again using conservation of ...
- Science Physics - A rubber ball of mass m1= 10kg is moving to the right with ...
- Physics - A ball with a mass of 12 g is moving at 15 m/s. It collides with a ...
- physics - A car of mass 1400kg moving south at 11m/s collides into another car ...

More Related Questions