Question

1 20 3 Diagram is snapshot before collision. Mass of each boxcar = 10,000 kg.

Refer to the illustration of three boxcars, above.

67. Our Boxcar 1 moves to the right at speed v₁ = 5.4 m/s. As part of the group of three boxcars, moving off at speed v_new to the right, Boxcar 1 has slowed down. This means that

A. rigidity force from the rail is vertically upward.

B. momentum was actually NOT conserved.

C. the third law interaction force on Boxcar 1 was leftward.

D. the first law of Sir Isaac Newton was nullified by friction.

Answer 1

Option (c) the third law interaction force on boxcar 1 was leftward. Is correct option.this is because when the speed of boxcar 1 is slowed down which means there is an acceleration towards left which helps to deaccelerate the boxcar 1. This means there is another force acting on box car1 towards left that is the normal reaction between box car 1 and box car 2 .they follow Newton's third law as they are equal and opposite in direction.