A ball moves so that its position, in metres at time t seconds is given by r=5ti+(6+9.5t-5t^2)

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A ball moves so that its position, in metres at time t seconds is given by r=5ti+(6+9.5t-5t^2)

[From: ] [author: ] [Date: 11-11-27] [Hit: ]

please explain, thank you-In order for the ball to hit the ground, the vertical component (j) has to be equal to zero.Therefore, you can just set 6 + 9.5t - 5t^2 = 0 and solve the equation for t.......

where the unit vectors i and j are horizontal and vertical, respectively. The origin is at ground level.

-- find the time when the ball the ground
please explain, thank you

-

In order for the ball to hit the ground, the vertical component (j) has to be equal to zero. Therefore, you can just set 6 + 9.5t - 5t^2 = 0 and solve the equation for t.

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