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Sia ? 4 years, 6 months ago
using diffrentiation method
x = 18t + 5t^2
dx / dt = 18 + 10t
v = 18 + 10t
t = 2 sec
v = 18 + 10 * 2
= 18 + 20
= 38 m / sec
t = 3 sec
v = 18 + 10 * 3
= 18 + 20
= 48 m / s
v(av) = 38 + 48/ 2
= 43 m/swc
dv / dt = 10
a = 10 m/ s
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