Question

A car that decreases its speed from 100 km/h to 20 km/h undergoes ______ acceleration.

Answer 1

negative?

Answer 2

100/20 = 5

Answer 3

A racing car travels with a constant tangential speed of 82.2 m/s around a circular track of radius 615 m.
(a) Find the magnitude of the car's total acceleration.

Answer 4

v^2/r

so 82.2^2/615 = 10.99 m/s^2
and the direction of the acceleration will
be toward the center of circle