Question

1. circle each of the speeds. draw a box around each of the velocities.

770 mi/hr
3 m/s north
a golf ball traveled 28 m/s at a 45° angle from the ground.
15 km/hr sw
150 mi/hr at 20° north of east
-15 mi/hr
4 cm/s in the positive direction
100 lightyears per century
300,000 m/s
28.9 centimeters per nanosecond

Explanation:

Step1: Recall speed and velocity definitions

Speed is a scalar quantity (magnitude only), velocity is a vector quantity (magnitude and direction).

Step2: Identify speeds

770 mi/hr, - 15 mi/hr, 300,000 m/s, 100 light - years per century, 28.9 centimeters per nanosecond are speeds as they have only magnitude.

Step3: Identify velocities

3 m/s North, 15 km/hr SW, 150 mi/hr at 20° North of East, A golf ball traveled 28 m/s at a 45° angle from the ground, 4 cm/s in the positive direction are velocities as they have magnitude and direction.

Answer:

Speeds: 770 mi/hr, - 15 mi/hr, 300,000 m/s, 100 light - years per century, 28.9 centimeters per nanosecond.
Velocities: 3 m/s North, 15 km/hr SW, 150 mi/hr at 20° North of East, A golf ball traveled 28 m/s at a 45° angle from the ground, 4 cm/s in the positive direction.