Question

The distance travelled by an object along a straight line in time $t$ is given by $s=3-4t+5t^2,$ the initial velocity of the object is

• A. 3 unit
• B. -3 unit
• C. 4 unit
• D. - 4 unit

Answer 1

Answer: (D)

Given distance travelled by an object along a straight line in time $t$ is
$3-4t+5t^2$
Here, the velocity $\frac{ds}{dt}=-4+10t$
Hence, initial velocity will be
${\left|u=\frac{ds}{dt}\right|}_{t=0}=-4$ unit