WAEC - Further Mathematics (2019 - No. 22)
A particle starts from rest and moves in a straight line such that its velocity, V ms\(^{-1}\), at time t second is given by V = 3t\(^2\) - 6t. Calculate the acceleration in the 3rd second.
0 ms\(^{-2}\)
3 ms\(^{-2}\)
6 ms\(^{-2}\)
9 ms\(^{-2}\)
Giải thích
V = 3t\(^2\) - 6t
\(\frac{dx}{dt}\) = 6r - 6
at t = 4
\(\frac{dx}{dt}\) = 6 x 4 - 6 = 24 - 6
= 18
at t = 3
\(\frac{dy}{dt}\) = 6 x 4 - 6
= 24 - 6
= 18
at t = 3
\(\frac{dx}{dt}\) = 6 x 3 - 6 = 18 - 6
= 12
\(\frac{dy}{dt}\) = 18 - 12
= 6ms\(^{-2}\)