A particle starts from rest and moves with constant acceleration. The distance covered in the last 2 s of a 10 s journey is 72 m. The acceleration is:
Options

Question

A particle starts from rest and moves with constant acceleration. The distance covered in the last 2 s of a 10 s journey is 72 m. The acceleration is:

G1 Physics · Accepted Answer

From rest, S(t) = (1/2)at². Distance in the last 2 s = S₁₀ − S₈ = 50a − 32a = 18a. Given 18a = 72, so a = 4 m s⁻².