## Rohangrr 3 years ago SIMPLE QUESTIONS FOR YOU ALL A bus was moving at a speed of 54 km/h. on applying brakes, it stopped in 8 seconds. calculate the speed acquired and distance traveled in this time.

The speed acquired is 0m/s

2. apoorvk

Speed acquired?????

Because the bus stopped

4. apoorvk

That be zero, since it stops!

5. Rohangrr

plzzz do show u r solutions

distance use, x = v=0.5(u+v)t

7. Rohangrr

So x = 0.5* 15 * 8 = 60m

9. apoorvk

Well, you have initial velocity = u = 54 kmph = 54 x (5/18) m/sec = 15 m/sec Final velocity = v = 0 Time = 8 seconds. Use Newton Unkle's equation # 1 ---> $$a = \frac{v-u}{t}$$, and fond out the deceleration 'a'. Then, use $$v^2 - u^2 = 2as$$ to find out the distance covered, i.e. 's'.

10. apoorvk

(Note of precaution: Newton's equations are only valid for uniform-linear motion, as you may know.)

11. King

sry... use $x=\frac{v+u}{2} \times t$

12. Rohangrr

thanks aproov it proved my solution was wrong

13. King

where v is final speed=0 u is initial speed=15 and t=8

14. apoorvk

Yeah, using the average velocity funda is good actually, @King

15. Rohangrr

oKAY thanks king to u as well

16. apoorvk

In fact innovative. :]

17. King

yw...thnx @apoorvk

18. Rohangrr

lol