Question

The distance traveled 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

The correct option is D -4 unit

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