Question 21
A bus moving along a straight highway with speed of $$72$$ km/h is brought to halt within $$4$$ s after applying the brakes. The distance travelled by the bus during this time (Assume the retardation is uniform) is _____ m.
Correct Answer: 40
Solution
v=72 km/h=20 m/s. t=4s. a=-20/4=-5 m/s². s=ut+½at²=20(4)+½(-5)(16)=80-40=40 m.
The answer is $$\boxed{40}$$.
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