A car starts a race from rest on a circular track and has a tangential speed of 43 m/s at the end of the third lap. The track has a radius of 91 m. If it has constant angular acceleration, what is the magnitude of its tangential acceleration?

Help me and please explain in simple terms because I'm very confused.

2 answers

a(τ) =ε•R =(v²/2•φ) •R =v²•R/2 • 2•π•N = v²•R/4•π•N
what is N