a ball is thrown vertically upward with a speed of 20 metre per second from ground find the time after which ball will strike back the ground
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u = 20m/s v = 0 m/s a = - 9.8 m/s^2
v = u + at
-u / a = t
- 20 / - 9.8 = 2 s (approx to reach up)
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