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4vir4ik [10]
3 years ago
8

A truck weighs twice as much as a car, and is moving at twice the speed of the car. Which statement is true about the

Physics
1 answer:
Alexeev081 [22]3 years ago
7 0

Answer: d

Explanation:

mass of truck mt, kinetic energy of truck Ekt(Kt), Vt -speed of truck

mass of car ma, kinetic enregy of car  Ekc(Kc), Vc-speed of car

mass of truck mt=2*mc

speed of truck Vt=2*Vc

Compare  Kinetic energy of truck with kinetic energy of car using equation to calculatation ;

Kinetic energy of car:

Kc=(mc*Vc²)/2

Kinetic energy for truck:

Kt=(mt*Vt²)/2

Kt=((2*mc*(2*Vc)²)/2

Kt=(2*mc*4*Vc²)/2

Kt=8*mc*Vc²/2

Compare Kinteic energy truck with Kinetic energy of car:

Kt/Kc

Kt/Kc=((8*mc*Vc²)/2)/((mc*Vc²)/2)

Kt/Kc=8

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