Special Relativity: Problem $1$

$(1$ point$)$

A train travelling at a speed of $0\mathrm{.}7$ times the speed of light takes $\backslash (10\backslash$times $10^\{-6\}\backslash )$ seconds to pass an observer on a nearby platform.

a$)$ What is the time interval in the train's frame of reference?

seconds.

What train length is measured by

a$)$ observers on the train?

m

b$)$ the observer on the platform?

m