Question

A Car increases its speed from 20 km/h to 50 km/h in 10 s. Find its acceleration​

Answer 1

Answer:

Here is your answer

Explanation:

acceleration is given by the change in velocity wrt to time.

so the total change in velocity is 30km/s.

acceleration is given by taking care of unit of the time and distance both

10×3600

30×1000

=

12

1

in m/s.

so none of the options is correct so the answer is D.

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Answer 2

Answer:

v = 50 km /hr = 50×5/18= 250/18 m/s = 13.8 m/s.

u= 20 km/hr = 20 × 5/18 =100/18 m/s = 5.5 m/s

t = 10 sec

Explanation:

a = v-u/t = 13.8 - 5.5 / 10 = 8.3/10 = 0.83 m/s^2.