A particle starts from rest

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

A particle starts from rest, attains a velocity of 20\,m/s in 4\,s, and then comes to rest again in the next 4\,s under uniform retardation. The average acceleration for the entire 8\,s interval is (a) 2.5 m/s22.5\,\text{m/s}^2 (b) −5 m/s2-5\,\text{m/s}^2 (c) 0 m/s20\,\text{m/s}^2 (d) 5 m/s25\,\text{m/s}^2

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