A. According to Ed, how far apart are Owen and Dina? B. According to Ed, how fas

Question

A. According to Ed, how far apart are Owen and Dina? B. According to Ed, how fast is the ball moving?

Owen and Dina are at rest in frame S', which is moving with a speed of v1 = 0.610c with respect to frame S. They play a game of catch while Ed, at rest in frame S, watches the action (see figure below). Owen throws the ball to Dina with a speed of v2 = 0.780c (according to Owen) and their separation (measured in S') is equal to d = 1.55 10^12 m. A. According to Ed, how far apart are Owen and Dina? B. According to Ed, how fast is the ball moving?

Explanation / Answer

a)

dx = sqrt(1 -0.61^2) *1.55*10^12 = 1.228 *10^12 m

b)

(-0.78 + 0.61)/(1 + -0.78*0.61) = -0.3243 c

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