Mass A is initially moving with some unknown velocity in the +x-direction. Mass
ID: 2304989 • Letter: M
Question
Mass A is initially moving with some unknown velocity in the +x-direction. Mass B is twice as massive as mass A and initially at rest. The two objects collide, and after the collision, they move together with a speed of 9 m/s in the +x-direction. Determine the initial velocity (in m/s) of mass A.Mass A is initially moving with some unknown velocity in the +x-direction. Mass B is twice as massive as mass A and initially at rest. The two objects collide, and after the collision, they move together with a speed of 9 m/s in the +x-direction. Determine the initial velocity (in m/s) of mass A.
Mass A is initially moving with some unknown velocity in the +x-direction. Mass B is twice as massive as mass A and initially at rest. The two objects collide, and after the collision, they move together with a speed of 9 m/s in the +x-direction. Determine the initial velocity (in m/s) of mass A.
Explanation / Answer
mA = m and mB = 2 m
Applying momentum conservation,
pi = pf
mA vAi + mB vBi = (mA + mB) v
(m v) + (2m x 0) = (2m + m) (9)
v = 3 x 9 = 27 m/s .....Ans