A ball of mass 0.5kg moving at 10ms\(^{-1}\) collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.
A
0.2ms\(^{-1}\)
B
0.5ms\(^{-1}\)
C
5.0ms\(^{-1}\)
D
5.5ms\(^{-1}\)
Verified Correct Answer: C.
Physical Principles & Numerical Solution
Using; \(m_1\) \(u_1\) + \(m_2\) \(u_2\) = (\(m_1\) + \(m_2\))v
\(m_1\) = 0.5kg, \(u_1\) = 10ms\(^{1}\), \(m_2\) = 0.5kg, \(u_1\) = 0
\(\therefore\) (0.5kg x 10) + (0.5 x 0) = (0.5 + 0.5)v
v = 5ms\(^{1}\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #60597)