Question

Find the initial velocity of a car which is stopped in 10 seconds by applying brake the retardation is 2.5 metre per second square
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Answer 1

Answer:

Initial velocity of a car is 25 m/s.

According to the given data, a car is stopped by brake application, which comes to rest after 10 seconds of movement. The equation of motion is to be calculated.

The first equation of motion is v = u + at. Here, acceleration is the retardation produced after brake application and the final velocity is zero as the car comes to rest.

\Rightarrow v=u+a t⇒v=u+at

\Rightarrow 0=u+(-2.5) \times 10⇒0=u+(−2.5)×10

\Rightarrow u=2.5 \times 10⇒u=2.5×10

\bold{\Rightarrow u=25\ \mathrm{m} / \mathrm{s}.}⇒u=25 m/s.

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hope it helps....

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Answer 2

Answer:

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