alleryStart learning →A stone is dropped from rest. After 2 seconds its velocity is approximately:
A4.9 m per second
B9.8 m per second
C19.6 m per second
D39.2 m per second
Answer & Solution
Correct answer: C. 19.6 m per second
1. Use v = u + gt with u = 0 (dropped from rest).
2. Take g = 9.8 m per second squared (downward) and t = 2 s.
3. v = 0 + 9.8 × 2.
4. v = 19.6 m per second.
5. Option B gives velocity after 1 s only; option D doubles unnecessarily.
_Source: Selina Concise Physics ICSE Class 9, Ch 2 'Motion in One Dimension' (aplustopper.com extract)_
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