A car is travelling at 72 kmh−1 and is 20 m from a barrier when the driver puts on the brakes. The car hits the barrier 2s later. What is the magnitude of the constant deceleration?

Question : A car is travelling at 72 kmh−1 and is 20 m from a barrier when the driver puts on the brakes. The car hits the barrier 2s later. What is the magnitude of the constant deceleration?

(A) 7.2ms^{-2}

(B) 10ms^{-2}

(C) 36ms^{-2}

(D) 15ms^{-2}

Answer : option (B)

Solution :

A car is travelling at 72 kmh−1 and is 20 m from a barrier when the driver puts on the brakes. The car hits the barrier 2s later. What is the magnitude of the constant deceleration?
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