Question

The displacement s of a moving particle at a
time t=3sec is given by s=5+20-t² find the velocity​

Answer 1

Answer:

0.3 is the answer

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Answer 2

60m/s

Step-by-step explanation:

Displacement is such type of a vector quantity that measures or describe about the shortest distance between initial position and final position. it is called as vector because it has fixed direction. Generally it is calculated by subtraction of initial  position from final position.

$s=5+20t^2\\\\\frac{ds}{dt}=\frac{d(5+20t^2)}{dt}\\=20t$

put $t=3$ second

$20\times3=60m/s$