Question

Displacement of an object is given by s= 2t+5t^2+3t^3 calculate instantaneous velocity of object at t=1

Answer 1

on doing derivative to displacement we get velocity
v=ds/dt=6t^2+10t+2
substitute t=1
v=6(1)^2+10(1)+2
v=6+10+2=18m/sec
v=18m/sec

Answer 2

that's the answer hope it helps you