Question

A bus increase its speedfrom 20km/h to50km/h in 10sec find its acceleration

Answer 1

Starting Speed (u) = 20km/h = 20×(5/18) m/s = 100/18 = 50/9 m/s.

Last Speed (v) = 50km/h = 50×(5/18) m/s = 250/18 = 125/9 m/s.

And, Time (t) = 10 seconds.

So, Acceleration (a) = (v - u)/t

a = { (125/9) - (50/9) } / 10

a = 75/9×10

a = 75/90 = 5/6

Acceleration (a) = 0.8333 m/s........... ●

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Hope it was helpful.

Answer 2

Answer:

Explanation:

Acceleration=Change in speed/Time=(50-20)*(5/18)/10=0.83m/s^2,

hope you understood.