Question

please give me right answer and with explanation. ​

Answer 1

$\huge \fbox \green{Answer:}$

$\textbf{Initial Velocity , U = 18/h}$

$\textbf{Final Velocity, V = 0m/s}$

$\textbf{Time Taken, T = 5s}$

$\text{ (i) \: Speed} = 18km/h = 18 \times \frac{5}{18} = 5m/s$

$\text{(ii) \:Using , v = u + at}$

$⇒a = \frac{v - u}{t}$

$⇒a = \frac{0 - 5}{5} = - 1/ {s}^{2}$

$⇒\text{Retardation} = 1m/ {s}^{2}$

$\text{( iii) \: Using , \: = } u + at$

$\textbf{ At ,t = 2s}$

$⇒v_{2s} = 5 + ( - 1)2$

$⇒u_{2s } = 5 - 2 = 3m/s$

$\\ \\ \\ \\ \sf \colorbox{gold} {\red(ANSWER ᵇʸ ⁿᵃʷᵃᵇ⁰⁰⁰⁸}$