# 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 :

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