Am struggling with these couple of questions

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Brock Skywalk
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Hello everyone,
i am new to this forum so please excuse me if i haven't found the search function. o.k., i am struggling with the following problems. i really don't have cash to get a tutor so i am hoping some of y'all can help a brother out. i am not sure what formulas to use and why. They are pretty similar & are as follows:

1.AN OBJECT IS THROWN STRAIGHT UP FROM THE GROUND LEVEL WITH A SPEED OF 50M/S. IF g = 10M/S^2 ITS DISTANCE ABOVE GROUND LEVEL 1.0 SECOND LATER IS?



2. y = 1/2(-10)*1^2 + 50*1



3. i got 45m
 
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