Arace car has a centripetal acceleration of 18.75 m/s2 as it goes around a curve. if the curve is a circle with radius 12 m, what is the speed of the car? a. 15 m/s b. 9.8 m/s c. 1.6 m/s d. 17.2 m/s

Option (A) is correct.

Explanation:

The centripetal acceleration is given by

a= v²/r

V= velocity

r= radius= 12 m

a= centripetal acceleration= 18.75 m/s²

18.75= v²/12

v²=18.75 x 12

v²=225

v= 15 m/s

no. dot product   =0 when vecs at right angles

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