Question

Q.9 A bus is travelling at 54 km/h. The driver applies brakes so that it retards uniformly to stop in 5 s. Find its retardation. Also, find the distance covered by the bus in this duration.
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Answer 1

Answer:

initial velocity(u)=54 km /h  or  54×5/18 m/s

final velocity(v)=0 m/s

time(t)=5 s

using 1st equation of motion,

v=u+at

0=54+5a

5a=-54

a=-54/5

a=-10.8 m/s

retardation= 10.8 m/s

using 2nd equation of motion,

distance(S)=

S=ut+1/2at²

S=54×5+1/2×10.8×5×5

S=270+135 m

S=405m

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Answer 2

Step-by-step explanation:

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