A car starts from rest and accelerates uniformly along a circular track of radius so…

PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

A car starts from rest and accelerates uniformly along a circular track of radius

100\,\text{m}

so that its speed reaches

20\,\text{m}\,\text{s}^{-1}

after

5.0\,\text{s}

. What is the angle between the car’s total acceleration vector and its velocity vector at

t = 4.0\,\text{s}

? (a)

57^{\circ}

(b)

33^{\circ}

(c)

15^{\circ}

(d)

45^{\circ}