please solve all and show steps! thank you An object is pushed verticaily down f

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please solve all and show steps! thank you

An object is pushed verticaily down from a height of 83 4 m, at an initial speed of v,-8.9 mis How long it takes the object to hit the ground (in s)? Answer planet an object is relesed trom the height of h-29 3m and it hits the ground after time 1:4 4 s. The acceleraltion due to gravity at that planet is ( is mis) ered f 1.00 stion Answer acceleration due to gravity was calculated from the folowing set of values obtained from a free fall of an vered ot 1.00 estion h = (1 . 49 ± 0.037im and t = (0.550.01 3) s The error on g is (in m's) Answer

Explanation / Answer

1. First of all, finding the final velocity when it hits the ground,

Using the equation:

v2 = vo2+ 2g(0-h) [ a=g ; downward motion ]

v2= (8.9)2- 2(9.81)(83.4)

v = -39.46 m/s

Now using equation of motion

v = v0+ gt

(39.46)= (8.9)+ (9.81)t

t = 3.11 s

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