Question

pls answer it fast guys

Answer 1

unclear , post again ---00000~@lice

Answer 2

acceleration of 1 m/s² for 18 metres only.

So,
using third equation of motion.
${v}^{2} = {u}^{2} + 2as \\ {v}^{2} = {8}^{2} + 2 \times 1 \times 18 \\ {v}^{2} = 64 + 36 \\ {v}^{2} = 100 \\ v = 10 \: metres \: per \: second.$
For second question also,
we will use the third equation of motion.
${v}^{2} = {u}^{2} + 2as \\ 0 = {20}^{2} + 2 \times a \times 50 \\ 0 = 400 + 100a \\ -100a = 400 \\ a = \frac{400}{ - 100} \\ a = - 4 \: mp {s}^{2}$
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