The velocity of the truck is 45 km/h because truck has momentum much higher than car.
Kinetic energy is the force that propels motion, which can be seen in the movement of a particle, an object, or a group of particles.
1) Determine the car's kinetic energy first:
kinetic energy= 1/2 mv^2
m-mass of the car:= 1000kg
v-velocity of the car = 15 km/h
kinetic energy of the car = 1/2*1000*15^2
=> 112500 Joules
2) the truck's kinetic energy should be calculated.
kinetic energy = 1/2mv^2
m-mass of the car= 2000kg
v-velocity of the car = unknown
kinetic energy of the truck = the kinetic energy of the car multiplied by 18= 112500 x 18= 2025000 joules
2025000 = 1/2*2000*v^2
2025= v^2
√2025 = 45
The velocity of the truck = 45 km/h
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