an object is projected upwards with a velocity of hundred metres it strikes the ground after (g=10)
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u = Initial velocity = 100m/s
v = 0m/s (When it reaches the highest point)
a = -g
t = ?
v = u + at
0 = 100 - gt
gt = 100
t = 100/g = 100/10 = 10s
Therefore, it takes 10s to reach the highest point and from there to the ground it takes the same time
Therefore, the object will strike the ground after 10+10 = 20s
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