An object of mass 2kg moving with a velocity 3ms-11 collides head-on with another object of mass 1kg moving in the opposite direction with a velocity of 4ms-1. If the objects stick together after collision, calculate their common speed.
-
A.
0.60ms-1 -
B.
0.67ms-1 -
C.
2.00ms-1 -
D.
3.33-1
Correct Answer: Option B
Explanation
(M_1V_1 – (M_2V_2) = V(M_1 + M_2))
2 x 3 – 1 x 4 = V(2 + 1)
V = (frac{2}{3})
= 0.67ms-1