Arre, force nikalne ke liye pehle acceleration find karna padega. Jaise v = u + at mein, final velocity zero hai, initial velocity nahi pata, par tum keh rahe ho "brought to rest," iska matlab retardation hua. Isliye minus sign yahi dikhata hai ki force jo laga, wah motion ke vipreet direction mein tha. Exact value ke liye initial velocity chahiye.
Meri life se dekho toh, terrace par hydroponic trays ko dheere se rokna hota hai, ek dum se nahi, warna paani uchal jaata hai. Wahi samajh aaya ki minus sign bas direction ki kahani hai—jaise main pump band karta hoon, to pani aage ko jaane ki jagah, wah vapas ko settle ho jaata hai.
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