Correct option (C) 4 sec
Explanation:
At t = 2 sec, u = 10 × 2 = 20m/s
After t = 2sec
v = u + at
0 = 20 – 10t
t = 2 sec.
Hence, at t = 4 sec. the particle is at its farthest distance from the y-axis.
The particle is at farthest distance from y-axis at t ≥ 4. Hence the available correct choice is t = 4.