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An object is projected upward with a velocity of 100m/s.Then how much time it will take to strike the ground?

initial velocity = 100 m/s
final velocity = 0 as it reaches the highest point
acceleration = - 9.8

we know that v = u + at
                      0 = 100 - 9.8t
                       -100 = -9.8t
                         -100/ -9.8 = t
                        
                         time (t) = 10 sec
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v=u+at 
0=100-10t
t=10 seconds
now this is the tim taken to reach the max point.2X10=20 is the time taken to strike the ground by the ball.
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10 sec
  • -9
We have u = 100m/s and take g = 10 m/s^2 Now, Using, T = 2u/g We get, T = 2*100/10 = 20 seconds. Hence the time taken by the object to strike the ground is 20 seconds.
  • 10
20 seconds.
  • -2
t = 20s
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