Posted by **justin** on Wednesday, January 12, 2011 at 2:16pm.

The position of a ball as its kicked upwards is measured as

y(t) =−(4.9 t^2 + 20t + 0.50)m,

where t is measured in seconds. Find the vertical component of velocity and acceleration of the ball as a function of time. If the ground is located at yg = 0, ﬁnd the time at which the ball hits the

ground.

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