Answer: it’s not line spectra
Explanation:
PENN foster
Answer:
Consider frames X and Y:
If X sees Y moving to his right then Y must see X moving to his right.
If this is not true then one can choose one frame over the other ( a favored frame and this is not allowed)
Friction !!!
The answer is C
F = m × a
m = 0.5kg
a = 3m/s²
F = 0.5 × 3
= 1.5N
