Question

1. write each speed in kilometres per hour.

a) a pitcher throws a baseball. the ball crosses home plate at a speed of 40 m/s.
b) a cockroach can travel at a speed of 1.5 m/s.

Explanation:

Step1: Recall conversion factors

1 km = 1000 m and 1 hour = 3600 s. To convert m/s to km/h, we multiply by $\frac{3600}{1000}=3.6$.

Step2: Convert the speed of baseball

For the baseball with speed $v = 40$ m/s, the speed in km/h is $v_{km/h}=40\times3.6 = 144$ km/h.

Step3: Convert the speed of cockroach

For the cockroach with speed $v = 1.5$ m/s, the speed in km/h is $v_{km/h}=1.5\times3.6=5.4$ km/h.

Answer:

a) 144 km/h
b) 5.4 km/h