Suppose a clock at rest measures 20 s for a task.The speed of the clock that would measure 10 s for the same task is
A)0.22 c.
B)0.59 c.
C)0.69 c.
D)0.87 c.

Name: Suppose a clock at rest measures 20 s for a task.The speed of the clock that would measure 10 s for the same task is A)0.22 c. B)0.59 c. C)0.69 c. D)0.87 c.
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Quizplus · Accepted Answer

The time dilation formula is $ t' = \frac{t}{\sqrt{1 - \frac{v^2}{c^2}}} $. Given $ t' = 10 $ s and $ t = 20 $ s, solving for $ v $ gives $ v = 0.87c $.

Suppose a Clock at Rest Measures 20 S for a Task.The