D3 points I Freeleus Anaws SarCFi1 & P044 A ? ?? 5-og car traveling initially wi

Question

D3 points I Freeleus Anaws SarCFi1 & P044 A ? ?? 5-og car traveling initially with speed of 25.0 m/s in an aastarty direction crashes into th rear end of 8,400-kg truck moving in the same directlon at 20.0 m/s pea figura below . The veodty of the car nght after the collision is 13.0 m/s to the east. 25.0 mys 20.0 m/s 18.0 m/s Before After a Whet is the velosity of the truck ight after the cullision? (Rund yuur answer to st least three detimel plaves.) 06 I s in thc colllon? How much mechanical encrgy is lo 1144.5 Accunt tor this loas in anengy Ths answer has not been gradad yet Need Help? Reud

Explanation / Answer

a) let the velocity of truck is v

Using conservation of momentum

1115 * 25 + 20 * 8400 = 18 * 1115 + 8400 * v

solving for v

v = 20.929 m/s

the velocity of truck is 20.929 m/s

b)

loss in energy = initial kinetic energy - final kinetic energy

loss in energy = 0.50 * (1115 * 25^2 + 20^2 * 8400 ) - 0.50 * (18^2 * 1115 + 8400 * 20.929^2)

loss in energy =8110 J

the energy lost is 8110 J

This energy is lost due to deformation of car and also as heat and sound

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