# Answer to Question #901 in Mechanics | Relativity for Peter Dillon

Question #901

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?

Expert's answer

By the equation of the motion:

v = v

50km/h = 13.89 m/sec;

0 = 13.89 - 10a;

a = 1.389 m/sec

v = v

_{0}- at;50km/h = 13.89 m/sec;

0 = 13.89 - 10a;

a = 1.389 m/sec

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