Question

The displacement of a particle moving along x-axis given by x= 20t+10t^2.calculate instantaneous velocity at t=2sec.

Answer 1

using differentiation method

x=20t+10t^2
dx/dt= 20+10t

v=20+10t
t=2 sec.
v=20+10×2
=20+20
=40m/s

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