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CBSE Class 9 Answered

A stone moves in a vertically upward direction with a velocity if 5m/s.If acceleration of the stone during motion is 10m/s2 in downward direction,what will be height attained and how much time will it take to reach there?
Asked by Yohan Zachariah | 11 Jul, 2011, 01:58: AM
answered-by-expert Expert Answer
Here, u = 5 m/s
         v = 0 m/s
         a = -10 m/s2
 
         S = ?
         t = ?
 
We know, v = u + at
 
              0 = 5 + (-10)t
 
              0 = 5- 10t
 
       =>   t = 0.5 s
 
 
Also, v2 - u2 = 2aS
 
        0 - 52 = 2(-10)S
 
             25 = 20 S
 
       =>    S = 1.25 m
Answered by | 10 Jul, 2011, 10:56: PM

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