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# Calculating acceleration and deceleration of a vehicle

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These are more physics related, but I'm having a lot of trouble with it and I'm getting kind of desperate right now since there's a lot of assignments like these but I'm not quite sure where to get started with these. I was hoping someone here could help me out with it.

a. A car accelerates from a standstill with a constant acceleration of 1,5 m/s2. Show with a calculation that the speed at 5 seconds is equal to 8,0 m/s.

b. A car drives up at a speed of 20 m/s and brakes. Show that the decelaration of car is equal to 2,0 m/s2 and that the braking distance is 100 meters.

off-topic
Dec 17, 2019

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a.  vf = vo + at       vf = final velocity --given as 8 m/s

vo= velocity original -- given as 0 (starts from standstill)

a = acceleration --- 1.5 m/s2

Plug and chug.......

b. same equation    vf = 0    vo= 20 m/s   a is NEGATIVE = -  2.0 m/s^2        this will allow you to find   't'

then use   xf = xo + vo t + 1/2 a t^2          xo = 0   xf= 100 m      Remember 'a' is negative (a DEcceleration)

Dec 17, 2019
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What would xo and xf stand for in b ? Sorry I'm just really confused and my brain is completely fried.

Guest Dec 18, 2019
edited by Guest  Dec 18, 2019