Posted by unknown on Tuesday, October 30, 2012 at 1:15am.
Child X throws 0.5 kg of Play
Dough at Child Y at 0.40 m/s at the same time that Child Y throws 0.8 kg of Play Dough at Child X at
0.20 m/s. The two masses of Play Dough collide and stick. What is the resulting speed and direction
of the Play Dough? What are the kinetic energies of the two masses before the collision? What is
the kinetic energy of the combined mass after the collision?

physics  Robert, Tuesday, October 30, 2012 at 1:33am
Since the masses stick together, there is conservation of momentum but no conservation of energy.
Let x be the new velocity.
Hence, 0.5*0.4 + 0.8*(0.20) = (0.5+0.8)*x
X = (0.20.16)/1.3 = 0.0307 m/s
KE = 0.5*1.3*0.0307^2 = 0.000615 J.
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