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Per NCERT Example 2.3, a ball thrown upward at 20 m/s from a height of 25 m (g=10 m/s², neglecting air resistance) takes how long to hit the ground?
A10 seconds
B3 seconds
C2 seconds
D5 seconds
Answer & Solution
Correct answer: D. 5 seconds
Per NCERT Example 2.3 second method: y = y₀ + v₀t + ½at² → 0 = 25 + 20t − 5t² → 5t² − 20t − 25 = 0 → t = 5 s.
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