Question:
The length of a rod is exactly $1 \mathrm{~m}$ when measured at rest. What will be its length when it moves at a speed of
(a) $3 \times 10^{5} \mathrm{~m} / \mathrm{s}$,
(b) $3 \times 10^{6} \mathrm{~m} / \mathrm{s}$ and
(c) $3 \times 10^{7} \mathrm{~m} / \mathrm{s}$ ?
Solution:
