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Physics Class 11 - Chapter 3 question 6 to 9

Q3.6 A car moving along a straight highway with speed of 126 km h–-1 is brought to a
stop within a distance of 200 m. What is the retardation of the car (assumed
uniform), and how long does it take for the car to stop ?

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Q3.7 Two trains A and B of length 400 m each are moving on two parallel tracks with a uniform speed of 72 km h–-1 in the same direction, with A ahead of B. The driver of
B decides to overtake A and accelerates by 1 ms–-2. If after 50 s, the guard of B just
brushes past the driver of A, what was the original distance between them ?

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Q3.8 On a two-lane road, car A is travelling with a speed of 36 kmh–-1. Two cars B and C approach car A in opposite directions with a speed of 54 kmh–-1 each. At a
certain instant, when the distance AB is equal to AC, both being 1 km, B decides
to overtake A before C does. What minimum acceleration of car B is required to
avoid an accident ?

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Q3.9 Two towns A and B are connected by a regular bus service with a bus leaving in
either direction every T minutes. A man cycling with a speed of 20 km h–-1 in the
direction A to B notices that a bus goes past him every 18 min in the direction of
his motion, and every 6 min in the opposite direction. What is the period T of the
bus service and with what speed (assumed constant) do the buses ply on the
road?

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Physics Class 11 - Chapter 1