Question

the displacement of an object varies with time according to equation y=(3÷8t2_3t+5)m. find the instantaneous velocity at t=4s​

Answer 1

Answer:

$y = \frac{3}{8 }{t}^{2} - 3t + 5 \\ velocity = \frac{dy}{dt} \\ = \frac{3}{8} \times 2t - 3 \\ = \frac{3}{4} t - 3 \\ = 0 \: as \: t = 4$