# If a Bus Travelling at 20 M/S is Subjected to a Steady Deceleration of 5 M/S2, How Long Will It Take to Come to Rest ? - Science

Short Note
Sum

If a bus travelling at 20 m/s is subjected to a steady deceleration of 5 m/s2, how long will it take to come to rest ?

#### Solution

We have to find the time taken to reach the given final velocity.
We have:
Initial velocity (u) = 20 m/s
Final velocity  (v) = 0 m/s
Acceleration for the entire journey (a) = –5 ms2.
Let the time taken be (t).
We can calculate the time taken using the first equation of motion.
t = (v-u)/a
Time taken by the bus to come to rest:
= (0-20)/-5
= 4 s

Concept: Measuring the Rate of Motion - Speed with Direction
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#### APPEARS IN

Lakhmir Singh Science Class 9 Physics
Chapter 1 Motion
Short Answers | Q 33 | Page 21