 # Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 1 - Motion

A motorcycle is being driven at a speed of 20 m/s when brakes are applied to bring it to rest in five seconds. The deceleration produced in this case will be:

a) +4 \mathrm{m/s^2}

b) -4 \mathrm{m/s^2}

c) +0.25 \mathrm{m/s^2}

d) -0.25 \mathrm{m/s^2}

The correct answer is a) +4 \mathrm{m/s^2}

Video transcript
"hey kids welcome to lido q a video i am vinit your leader tutor bringing this question on your screen a motorcycle motorcycle is being driven at a speed of 20 meter per second when breaks are applied to bring it to rest in five seconds the de-acceleration decks produced in this case will be now what do you understand by de-acceleration deacceleration in this case is the time taken deacceleration is the process of coming to a complete hot right now time taken is equal to 5 seconds right what was the speed the speed was 20 meter per second yes therefore to come from 20 meter to 0 right zero meter per second what is the de-acceleration uh speed or the de-acceleration so therefore the acceleration is from 20 meter per second to 0 meter per second right therefore the acceleration is given by speed by time or the initial speed by time this will be equal to 20 by 5 which is equal to 4 meter per second square isn't that easy guys right so if you still have a doubt please leave a comment below and do like the video and subscribe to our channel i'll see you in our next video until then bye kids keep learning"
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