Question

A car increases its speed from 20 km/h to 50 km/h in 10 seconds. what is itts acceleration ?


Please answer quickly !

Answer 1

In question it should be velocity-

$\red{\boxed{\huge{acceleration = \frac{change \: in \: velocity}{time \: taken}}}}$

$change \: velocity \: in \: m {s}^{ - 1} \\ so \\ initial \: velocity = 20km {h}^{ - 1} = \frac{100}{18} m {s}^{ - 1} \\ final \: velocity = 50km {h}^{ - 1} = \frac{250}{18} m {s}^{ - 1} \\ now \: \\ a = \frac{ \frac{250}{18} - \frac{100}{18} }{10} \\ a = \frac{150}{180} \\ a = \frac{5}{6} m {s}^{ - 2} = 0.83m {s}^{ - 2}$

$\huge{\blue{\underline{acceleration=0.83}}}$

Answer 2

hi

buddy ✌️✌️✌️✌️

Initial velocity = u = 20km/hr = 20 x 5/18 = 5.56 m/s

Final velocity = v = 50 km/hr = 50 x 5/18 = 13.89 m/s 

Time = t = 10 sec

Acceleration = a 

a = (v- u) / t

   = (13.89 -  5.56) / 10

   = 0.833 m/s²

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