Question

plz answer fast guys it is very important answer should be correct​

Answer 1

Answer:

a. $\frac{108}{5}$ km/h                                      [$\frac{m}{s} * \frac{18}{5} = \frac{km}{h}$]

b. Displacement = 2R = 2x14 = 28m      [equal to diameter]

    Distance = $\pi R$ = $\frac{22}{7} * 14$ = 44m            [ Half revolution is half the                                                                                                     .                                                               circumference i.e. $\frac{2\pi r}{2}$]

c.  Speed of car in first 30 km = 40 km/h = $v_{1}$

    Time taken to cover = $\frac{Distance}{Speed}$ = $\frac{30}{40}$ = $\frac{3}{4}$ h

    Speed of car in next 30 km = 20 km/h = $v_{2}$

     Time taken to cover = $\frac{Distance}{Speed}$  = $\frac{30}{20}$  = $\frac{3}{2}$ h

    Average Speed = $\frac{Total Distance}{Total Time}$ = $\frac{30+30}{\frac{3}{4} +\frac{3}{2} }$ =  $\frac{80}{3}$ km/h = 26.6 km/h

Hope This Help You!

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Explanation:

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