Kinematics Question 377

Question: A car of mass 1000 kg is moving at a speed of 30 m/s. Brakes are applied to bring the car to rest. If the deceleration it’s 5m/s2 the car comes to stop after travelling d m in t s. Then

Options:

A) d = 150, t=5

B) d = 120, t=5

C) d = 180, t=6

D) d = 90, t=6

Show Answer

Answer:

Correct Answer: D

Solution:

Given: mass of car m=1000kg ;  m=30m/s;

v=0m/s Retardation, a=5m/s2 By equation, v2u2=2as

0(30)2=2×5×d
d=90010=90m

and a=vutt=vua=0305=6s



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