WAEC - Physics (2023 - No. 31)
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
\(50ms^1\)
\(45ms^1\)
\(20ms^1\)
\(10ms^1\)
Explanation
\(v_P = 30 ms^{-1}\), \(v_Q = 20 ms^{-1}\)
\(v_P = v_Q + v_{P/Q}\)
\(v_{P/Q} = v_P - v_Q\) = 30 - 20
∴ \(v_{P/Q} = 10 ms^{-1}\)
\(v_P = v_Q + v_{P/Q}\)
\(v_{P/Q} = v_P - v_Q\) = 30 - 20
∴ \(v_{P/Q} = 10 ms^{-1}\)
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