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how can i solve this equation!A stationary car of 200kg is rammed from behind by a truck of mass 800kg moving at 40km/h .if the vehicle together on impact , find common speed after the collision.
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ken162

by ken162 at February 11, 2011

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This is a conservation of momentum problem.  Momentum is mass times velocity.  Conservation means the momentum before the collision is equal to the momentum after the collision, So: Before momentum is: (200kg)(0) + (800kg)(40km/h) = 32000kgkm/h After momentum is: (200kg + 800kg)(V) = 1000V Since the momentum is conserved: 1000V = 32000 V = 32 km/h The truck lost momentum, but the car gained an equal amount so the total momentum was the same before and afterwards.
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kroo_jteague kroo_jteague February 11, 2011

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This is an inelastic collision and momentum is conserved.find the P of both the objects before collision.For the car it is=0( at rest)For the truck=800x40=32000kg.km/hrThe total before collision=32000kg.km/hrSince it is an inelastic collision, they are stuck after and so you add  the masses. Aftr collision, the mass=1000kg. We are looking for the velocity , which we =vSo the P after collision=1000.vP before=Pafter1000xV=32000  solving for V=32 km/hrthe speed is 32km/hr
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chitra003 chitra003 February 12, 2011

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