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a truck m2=3500kg collides with a stationary car m1=1700kg. after collision, both vehicle move together with...

a truck m2=3500kg collides with a stationary car m1=1700kg. after collision, both vehicle move together with speed +1.5m/s
a.what type of collision is this, and what physical quantity is conserved?
b.calculate initial velocityof truck in km/h
c. what is the change ib kinetic enegy of system?
d.what happened to energy lost in collision?

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