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Please help with #8... Thanks in advance

Please help with #8... Thanks in advance-example-1
User Nillu
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If the acceleration is constant, and the starting velocity is zero, the relationship between the acceleration of a falling body (a), the time it takes to fall (t), and instantaneous velocity when it hits the ground (v) is:

the general equation of acceleration is:

vf = vi + at

assuming the initial velocity (vi) is zero, the equation becomes:

vf = at

v = at
User Bdombro
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