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March 31, 2015

March 31, 2015

Posted by **Amber** on Friday, September 6, 2013 at 5:11pm.

- Physics -
**Graham**, Friday, September 6, 2013 at 8:42pmFind: a

Given:

s = (1.9-1.0)[km]

u = 100[km/h]

v = 80[km/h]

Using two equations:

<1>: s = u t + ½ a t²

<2>: v = u + a t

Rearrange <2> to get t.

t = (v-u)/a

Substitute this into <1> to get a.

s = u(v-u)/a + (v-u)²/(2a)

Rearrange

.: a = (v²-u²)/(2s)

Calculate using the given values.

I suggest converting from [km/h²] to [m/s²]

- Physics -
**Cahd**, Sunday, January 11, 2015 at 5:46pm34

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