Question

please help me to solve these questions

Answer 1

hey here is your answer
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$given \\ a = - 3 \: \frac{m}{ {s}^{2} } \: \: \: and \: v = 0 \: \frac{m}{s} \: \: \: \\ t = 10 \: s \\ then\\ a = \frac{v - u}{t} \\ - 3 = \frac{0 - u}{10} \\ - 3 \times 10 = - u \\ u = 30 \: \frac{m}{s}$