Q19 · 2021 · Paper 1Simple familiar1 mark
QUESTION 19
A spaceship with a velocity of 9.0 × 107 m s–1 is measured to be 125 m in length by an observer at rest. Calculate the length of the spaceship as measured by somebody on board the spaceship.
(A)
119 m
(B)
131 m
(C)
137 m
(D)
178 m
WORKED SOLUTION
1 markAnswer B
ANSWER
B
Worked solution
The 125 m length is length-contracted. With , , so m. Option B.
Selects option B.
Worked explanation by QCE Vault; correct option verified against the QCAA answer key.