Kinematics Question 359

Question: If a car at rest accelerates uniformly to a speed of 144 km/h in 20 s, it covers a distance of

Options:

A) 2880 m

B) 1440 m

C) 400 m

D) 20 m

Show Answer

Answer:

Correct Answer: C

Solution:

Initial velocity of car (u) = 0 Final velocity of car (v)=144km/hr=40m/s Time taken = 20s We know that, v=u+at

40=a×20a=2 m/s2.

Also, v2u2=2ass=v2u22a
s=(40)2(0)22×2=16004=400 m



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