A box of mass m 1 moves with speed v 1 on a frictionless track before it collide

Question

A box of massm1moves with speedv1on a frictionless track before it collides head on with a box of massm2, initially at rest. After the collision, the two boxes stick together and travel as one unit to the end of the track, from where they fall to the ground.
a) Is momentum conserved in the collision? Is kinetic energy conserved in the collision?
b) Calculate the velocity of the boxes after the collision? (Answer: 1 m/s )
c) How long does it take for the boxes to fall from the track to the ground? Please useg= 10 m/s2
d) At what horizontal distancedfrom the end of the track do the boxes land on the ground?

Explanation / Answer

a>yes as no external force b>2*3=(2+4)*v =>v=1 c>h=1/2 g *t^2 =>t=(2*5/9.8)^.5=1.01 d>s=1.01*v=1.01*1 m=1.01m

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