A ball moves in the direction of the arrow labeled e below. The ball is struck b

Question

A ball moves in the direction of the arrow labeled e below. The ball is struck by a stick which briefly exerts a force on the ball in the direction of the arrow labeled g below. j zero magnitude which arrow best describes the direction of AP, the change in the ball's momentum? V Select Submit d Practice Another Version Progress My Notes Ask Your T -1 po g A railro j Neighing 279 kN and traveling at 1.53 m/s overtakes one weighing 206 kN and traveling at 0.914 m/s in the same direction. The cars couple together

Explanation / Answer

Solution:

a) The initial direction of the ball is towards South (e).

It is struck by another object moving towards west (g).

So the resultant direction is South west . (SW) which is represented by f

b)

The initial velocity of the first object = v1 = 1.53 m/s

Mass = m1 = 279000 N /9.8 kg = 28469 kg

Mass of the 2nd object = m2 = 206000 N /9.8 = 21020 kg

Velocity of 2nd object = v2 =0.94 m/s

The collision is Inelastic since they coupled together after collidiing.

m1v1 +m2v2 = (m1+m2)V

V = (m1v1 + m2v2 ) /(m1+m2)

    = (28469 * 1.53 + 21020 * 0.94 ) / (28469 + 21020 )

    = 1.279 m/s = Velocity of the combined system of the railroad cars.

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