A body starts from rest and moves with uniform acceleration of 6m/s2. What distance does it cover in the third second?

Physics Jamb, Waec, Neco Past Questions & Answers on Speed, Velocity and Acceleration

QUESTIONS 7. A body starts from rest and moves with uniform acceleration of 6m/s2. What distance does it cover in the third second?

A.15m B. 18m C. 27m D. 30m

JAMB 1992 Ans: 15m

Solutions

Initial velocity = 0m/s

Acceleration = 6m/s²

Distance S in the third second. It's between second seconds and third seconds

Using second equation of motion

S = ut + ½at²

Hence S = S3 - S2

S = ½a(t3² - t2²)

S = ½ x 6 (3² - 2²)

S = ½ x 6 (9-4)

S = 6/2 (5)

S = 3(5)

S = 15m Answer