Question

The displacement of a particle is given by X=t^2 - 2 whereX is in metres and tin seconds . The velocity of the particle at t= 4 seconds is
(a) 4 m/s
(b) 8 m/s
(c) 12 m/s
(d) 16 m/s​

Answer 1

Answer:

the velocity will be 8m/s

Explanation:

given, x=t²-2

we know the velocity is the rate of change of displacement.

to get velocity we need to derevative x with respect to t

so, dx/dt=2t

v=2t

we need velocity of the partical at t=4 second

simply v=8 m/s