Question

On a frictionless surface, a 2-kilogram cart moves at a velocity of 3 meters per second west and hits a 4-kilogram cart that is not moving, initially. The two carts stick together and move off at a slower speed to the west. What is this slower speed?

a. 0. 5 meters/second


b. 1 meter/second


c. 1. 5 meters/second


d. 2 meters/second

Answer 1

b

Step-by-step explanation:

Use law of conservation of momentum

momentum before = momentum after hit

2 kg * 3 m/s = ( 2 + 4) kg * x m/s

solve for x = 1 m/s