Question

A car accelerates at 2 m/s2. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 20 m/s? A. 2 seconds B. 10 seconds C. 20 seconds D. 40 seconds E. none of the above

Answer 1

Answer: B. 10 seconds

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Answer 2

The car need 10 seconds to accelerate to a speed of 20 m/s.

Acceleration:

It is defined as the rate of change in velocity with time. The change can speed change or direction change.

The formula,

$\bold {a = \dfrac vt}$

Where,

a - acceleration = 2 $\bold { m/s^2 }$

v - velocity  = 20 m/s

t -time = ?

Put the values in the formula,

$\bold {a = \dfrac {20}{2}= 10\ s}$

Therefore, the car need 10 seconds to accelerate to a speed of 20 m/s.

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