A ball is thrown upwards from the ground work an initial speed of u. the ball is at a height of 80m at two times. the time interval being 6 s. find u
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s=ut +1/2at^2
here s=80 t=6 a=g=10
80=6u+360/2
-6u=100
u=-100/6
here s=80 t=6 a=g=10
80=6u+360/2
-6u=100
u=-100/6
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