Question

The displacement of an object varies with time according to the equation,
y = ( 3/8t^2 - 3t +5) Find the instataneous velocity at t = 4s.

(A) 45 m/s
(B) 12 m/s
(C) 3 m/s
(D) 0 m/s​

Answer 1

Answer:

0 m/s

Explanation:

Instantaneous velocity$= \frac{dy}{dt}$

y is the displacement (function of t)

t is the time taken

$\frac{d( \frac{3}{8} t^{2} - 3t + 5) }{dt}\\ = \frac{3}{8} * 2*t-3 \\=\frac{3}{4}t -3$

since t=4

instantaneous velocity = 0 m/s

Answer 2

Answer:

0 m/s

Explanation:

Instantaneous velocity

y is the displacement (function of t)

t is the time taken

since t=4

instantaneous velocity = 0 m/s

Explanation: