A body of mass 4.2kg moving with velocity 10ms-1 due east, hits a stationary body of mass 2.8kg. If they stick together after collision and move with velocity V due east, calculate the value of V
A
3ms-1
B
6ms-1
C
7ms-1
D
15ms-1
E
17ms-1
Verified Correct Answer: B.
Physical Principles & Numerical Solution
M1U = (M1 + M2)V = 4.2 x 10 = (4.2 = 2.8)V
∴ V = 4.2 x 10/7.0 = 6m/s
Source: Myschool Past Questions Archive (Record #25206)