A 4.0 kg mass has a velocity of 10 m/s to the EAST.The 4.0 kg mass undergoes an acceleration of 4.0 m/s² to the WEST for 3.0 sec.What is the velocity of the 4.0 kg mass at the end of the 3.0 sec interval? A) 22 m/s to the WEST B) 2.0 m/s to the WEST C) 0.0 m/s D) 2.0 m/s to the EAST E) 22 m/s to the EAST

Question

Quizplus · Accepted Answer

We can use the equation: 
final velocity = initial velocity + acceleration x time
The initial velocity of the 4.0 kg mass is 10 m/s to the EAST. The acceleration is 4.0 m/s^2 to the WEST, so we use a negative sign for acceleration. The time is 3.0 sec.
Final velocity = 10 m/s - 4.0 m/s^2 x 3.0 sec = 10 m/s - 12 m/s = -2.0 m/s to the WEST (since the velocity is now in the opposite direction). 
Therefore, the answer is B: 2.0 m/s to the WEST.

A 40 Kg Mass Has a Velocity of 10 M/s to to the EAST.The