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Question Number 142992 by otchereabdullai@gmail.com last updated on 08/Jun/21

Commented by otchereabdullai@gmail.com last updated on 08/Jun/21

$$\mathrm{please}\mathrm{help}\mathrm{me}\mathrm{understand}\mathrm{why}\mathrm{we}$$$$\mathrm{have}\mathrm{S}=-20\mathrm{m}\mathrm{in}\mathrm{option}\left(\mathrm{b}\right)$$

Commented by Olaf_Thorendsen last updated on 08/Jun/21

$$atthebeginningh=0m$$$$attheend,whenthestonehitsthe$$$$ground,h=-20mbecause$$$$thecliffis20mhigh.$$

Commented by otchereabdullai@gmail.com last updated on 08/Jun/21

$$\mathrm{thank}\mathrm{you}\mathrm{sir}!$$

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