(i) Area under the curve = 2 x 20 + 0.5 x 4 x 20 = 40 + 40m = 80 m
(ii) a = gradient = $\frac{20-0}{10-14}$ = $\frac{20}{-4}$ = - 5m/s2
(iii) F = ma
= 2 x -5m/s2
= - 10 N
johnmulu answered the question on May 15, 2017 at 12:46
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