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CBSE PHYSICS Class 11(Class XI)textbook. Exercise and Additional exercise.
NCERT/CBSE PHYSICS CLASS 11 textbook http://www.TutorBreeze.com Contact for Online Tutoring in Physics, Math, Chemistry, English Solutions/Answers to NCERT/CBSE PHYSICS Class 11(Class XI)textbook Exercise and Additional exercise CHAPTER THREE MOTION IN A STRAIGHT LINE EXERCISES 3.8 On a two-lane road, car A is travelling with a speed of 36 km h–1. Two cars B and C approach car A in opposite directions with a speed of 54 km h–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 ?
Q. 3.8 Two lane road Speed of Car A = 6 km/hr = 10 m/s Speed of car B (VB
) = 54 km/r = 15 m/s
Speed of car C (VC
) = 54 km/r = 15 m/s
Relative speed of Car B wrt Ai.e., VBA = VB − VA = 15 − 10 = 5m/s Relative speed of Car C, w.r.t. A
i.e.,
VCA = VC − ( −VA ) = VC + VA = 15 + 10 = 25m / s AB = AC = 1 km =1000 m. S = ut
t=
A S 1000 = C = = 40s u VCA 25
Let A = acceleration of car B for t = 40 s S = ut +