Physics

Problem

78. A toy car moves 3.0 m to the North in one second. The car then moves at

9.0 \mathrm{~m} / \mathrm{s}

due South for two seconds. What is the average speed of the car for this three second trip? (A)

4.0 \mathrm{~m} / \mathrm{s}

(B)

5.0 \mathrm{~m} / \mathrm{s}

(C)

6.0 \mathrm{~m} / \mathrm{s}

(D)

7 \mathrm{~m} / \mathrm{s}

(A)

4.0 \mathrm{~m} / \mathrm{s}

(B)

5.0 \mathrm{~m} / \mathrm{s}

(C)

6.0 \mathrm{~m} / \mathrm{s}

(D)

7 \mathrm{~m} / \mathrm{s}