25. A motorist travelling at 13 ms-l approaches trafficlights, which t

1.	25. A motorist travelling at 13 ms-l approaches trafficlights, which turn red when he is 25 m away fromthe stop line. His reaction time (i.e. the intervalbetween seeing the red light and applying thebrakes) is 0.7 s and the condition of the road and histyre is such that the car cannot slow down at the rateof more than 4.5 ms-2. If he brakes fully, how farfrom the stop line will he stop and on which side of it.
Answer» Answer: 17 m from the stop LINE not crossing the traffic lights Explanation: the car will decelerate between time INTERVAL .7s at 4.5 ms^2. so distance COVERED= 8 m formula used s=ut=1/2at^2 8m is LESS than 25m so 25-8=17m from the sto line.

25. A motorist travelling at 13 ms-l approaches trafficlights, which turn red when he is 25 m away fromthe stop line. His reaction time (i.e. the intervalbetween seeing the red light and applying thebrakes) is 0.7 s and the condition of the road and histyre is such that the car cannot slow down at the rateof more than 4.5 ms-2. If he brakes fully, how farfrom the stop line will he stop and on which side of it.

Answer»

Answer: 17 m from the stop LINE not crossing the traffic lights

Explanation: the car will decelerate between time INTERVAL .7s at 4.5 ms^2.

so distance COVERED= 8 m formula used s=ut=1/2at^2

8m is LESS than 25m so 25-8=17m from the sto line.

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