A car, P, with a velocity of 30 m/s is traveling in the same direction as a car, Q, with a velocity of 20 m/s. The velocity of P relative to Q is
A
\(50ms^1\)
B
\(45ms^1\)
C
\(20ms^1\)
D
\(10ms^1\)
Verified Correct Answer: D.
Physical Principles & Numerical Solution
\(v_P = 30 ms^{-1}\), \(v_Q = 20 ms^{-1}\)
\(v_P = v_Q + v_{P/Q}\)
\(v_{P/Q} = v_P - v_Q\) = 30 - 20
∴ \(v_{P/Q} = 10 ms^{-1}\)
Source: Myschool Past Questions Archive (Record #69403)