What is the final velocity of the combined bumper cars
a 225 kg red bumper car is moving at 3.0 m/s. it hits a
stationary 180 kg blue bumper car. the red and blue bumper
cars combine and hit a stationary green bumper car of mass
150 kg. the red, blue, and green bumper cars all combine.
0.93 m/s
1.2 m/s
1. don's
2.7 m/s

B) 1.2 m/s

Explanation:

Collision 1

Mr Ur + Mb Ub = (Mr+Mb) V

225 × 3 + 0 = (225 + 180 ) V

V = 675/ 405

1.67 kg.m/s

Collision 2

(Mr+Mb) V + Mg Ug = (Mr+Mb+Mg) V'

675 + 0 = 555 V'

V' = 1.2 m/s

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

iron would move it is magnetic there is a mag field around the current in the wire