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/s^{2}. 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/s^{2} and that the braking distance is 100 meters.

Guest Dec 17, 2019

#1**0 **

a. v_{f = }v_{o }+ at vf = final velocity --given as 8 m/s

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

a = acceleration --- 1.5 m/s^{2}

^{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)}

Guest Dec 17, 2019