Question

A car begins braking at 50 km/h and comes to a complete halt in 10s ; what was the acceleration (in standard units) over this period?

Answer 1

By the equation of the motion:
v = v₀ - at;
50km/h = 13.89 m/sec;
0 = 13.89 - 10a;
a = 1.389 m/sec²