Albert views henry moving by at a constant velocity. henry has a light clock and also a stopwatch which were synchronized when at rest. as albert views these two moving clocks, which of these statements would be true according to albert?
a. the light clock runs slow compared to the stopwatch.
b. the stopwatch runs slow compared to the light clock.
c. the two are still synchronized but run fast.
d. the two are still synchronized but run slow.

d). The two are still synchronized but run slowly

Explanation:

Here Albert is stationary and Henry is running with a constant velocity  carrying a stopwatch and a light clock which are both synchronized  when they are at rest. Now when both the clock are moving at the same constant speed, then they will remain synchronized and will show the same time. But they will definitely run slow for Albert because Albert is at rest with respect to the two clocks. Observers measures clocks that move relative to them as running slow. This is given by Theory of relativity that when clocks are moving they run slow because everything is relative to each other and it depends on our frame of reference.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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nah.   i'm just sleepy.