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# Physics forces question watch

1. Stuck on b ii..
Help much appreciated.👍
2. (Original post by Mystery.)

Stuck on b ii..
Help much appreciated.👍
F = ma
F = m(v-u) / t
t = F / m(v-u)

... ?????
3. Well from part a, you should have calculated 11ms^-2, as F=ma can be rearranged to F/m=a, meaning 110/10=11. Therefore, using suvat, time can be calculated using: t= √(2s/a), meaning t= √(2*8/11)= 1.21 seconds (to 3sf)

4. Here is how I calculated it using a suvat equation. Sorry about the blurry photo and messy writing!!

Hope this helps xx

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