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Asked by Rahul Last Modified
Answer 
Harshit Bhardwaj
Initial speed of the bus, u = 80 km/h 
Final speed of the bus, v = 60 km/h 
Time take to decrease the speed, t = 5 s
Here, the negative sign of acceleration indicates that the velocity of the car is decreasing.
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Bhanu Shringi
B.tech in ECE as well as B.Ed & CTET qualified with 8+ years of experience in teaching of Physics
Concept- 1 km/hr = 1000/(60x60)m/s
=( 5/18 )m/s ( Always convert all quantities into same unit) (prefer SI Units)
Given- u = 80km/hr = (80x 5)/18 m/s,
v= 60km/hr=( 60x 5) /18 m/s,
t= 5 sec
Solution- since V=u+at
∴ a= (v-u) /t
= [{( 60x5)18}-{(80x5) /18}]÷ 5
Take 5/18 common
=(5/18) [60-80]÷5
Numerator and denominator 5 will be cancelled out and you will get
= -20/18 = (-10/9) m/s²
Here minus sign indicates that acceleration is negative I. e it is Retardation or Velocity is decreasing with time
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Mehemud Ali
Completed graduation in Mathematics from Calcutta University
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