Atrain car moving along at 3 m/s runs into another train car at rest on the track. the cars attach together and continue moving in the same direction. the velocity of both cars together after the collision is

by conservation of momentum

momentum be4 collison = mass x vel = mass x 3

= momentum after collision = (mass + mass) x new vel = 2 x mass x new vel

new vel = 3/2 = 1.5 m/s

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the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."