a car of mass 1689 kg collides head-on with a parked truck of mass 2000 kg. spring mounted bumpers ensure that the collision is essentially elastic. if the velocity of the truck is (in the same direction as the car's initial velocity) after the collision, what was the initial speed of the car?



Answer :

If the velocity of the truck is (in the same direction as the car's initial velocity) after the collision, The initial speed of the car is 18.565 km/h.

Let the initial velocity of the car be uc

the truck is parked it implies ut = 0

for a head on elastic collision the final velocities are given by

[tex]vc = - (mt - mc/mt + mc) uc[/tex]

[tex]vt = (2mc/mt + mc)uc[/tex]

Velocity (vt)  = 17 Km/hr

uc = 18.565 Km/hr

In physics, a collision, which is also known as an impact, is the abrupt, violent coming together in close proximity of two bodies, such as two pool cues,  The force and the amount of time the objects are in touch, in addition to the materials the two objects are made of, have an impact on the outcome of the impact. It is generally knowledge that a hard steel ball dropped on a steel plate would rebound almost to the original position from where it was dropped, while a ball made of putty or lead will not.

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