A car is travelling at a certain speed. Its final velocity reaches 40 m/s in 10 seconds accelerating at the rate of 2.5 m/s $^{2}$ . Find the initial velocity of the car.

20 m/s

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0 m/s

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15 m/s

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10 m/s

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Solution

The correct option is B 15 m/s
Given,
Time $(t) = 10$ seconds
Accelerartion $(a) = 2.5$ m/s $^{2}$
We know $v = u + a t$
$\Rightarrow 40 m / s = u + 2.5 \times 10 m / s^{2}$

$\Rightarrow 40 m / s = u + 25 m / s$

$\Rightarrow u = (40 - 25) m / s$

$u = 15 m / s$

$∴$ initial velocity of the car $= 15$ m/s

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A car is travelling at a certain speed. Its final velocity reaches 40 m/s in 10 seconds accelerating at the rate of 2.5 m/s2. Find the initial velocity of the car.

The correct option is B 15 m/sGiven,Time (t)=10 secondsAccelerartion (a)=2.5 m/s2We know v=u+at⇒40m/s=u+2.5×10 m/s2⇒40m/s=u+25 m/s⇒u=(40−25) m/s u=15m/s ∴ initial velocity of the car =15 m/s

A car is travelling at a certain speed. Its final velocity reaches 40 m/s in 10 seconds accelerating at the rate of 2.5 m/s $^{2}$ . Find the initial velocity of the car.