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A ball is thrown upward at t = 0 sec, it is at the same height at t = 1 sec and t = 3 sec then maximum height attained by the ball is 1)10m 2)20m 3)30m 4)40m

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3 years ago

Sarfaraz Ahamed
26 Points
```							The Answer is 2)20mlet us consider that the ball is at a height h at time t=1s and t=3slet us assume that g=10m/s2then h=u*1-1/2(g*12) for t=1sand h=u*3-1/2(g*32) for t=3stherefore h=u-5 for t=1s and h=3u-45 for t=3stherefore u-5=3u-45therefore u=20m/sthe maximum height is given by u2/(2g)=202/2*10=20m
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2 years ago
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• 731 Video Lectures
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• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions