A man walks 10 km north, turns around and walks 5 km south. What displacement did the man walk? A. 10km S
B. 5km N
C. 15km N
D. 5km S

The total displacement is 5 km North (answer B)

Explanation:

Recall that displacement is defined by the vector formula:

Displacement = Final position - initial position

Which corresponds to a vector with its tail at the starting point, and the arrow at the final position. This gives a vector pointing North, and of length 5 km.

This agrees with answer labeled B.

the answer is b

explanation:

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2