An object thrown vertically upwards is at the same height at times 2 s and 8 s. The total time for which it stays in air and magnitude of its initial velocity respectively are [Take g = 10 m/s2] (1) 10 s, 100 m/s (2) 10 s, 50 m/s (3) 5 s, 100 m/s (4) 5 s, 50 m/s
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