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A car takes 100 metres to decelerate from 25 m s−1 to a complete stop.Which of the following describes all of the known variables in this situation?A$s=100\ \mathrm{m},\ \ u=25\ \mathrm{m\ s^{-1}}$s=100 m,  u=25 m s−1​B$s=100\ \mathrm{m},\ \ u=25\ \mathrm{m\ s^{-1}},\ \ v=0\ \mathrm{m\ s^{-1}}$s=100 m,  u=25 m s−1,  v=0 m s−1​C$s=100\ \mathrm{m},\ \ v=25\ \mathrm{m\ s^{-1}}$s=100 m,  v=25 m s−1​D$s=100\ \mathrm{m},\ \ v=25\ \mathrm{m\ s^{-1}},\ \ u=0\ \mathrm{m\ s^{-1}}$s=100 m,  v=25 m s−1,  u=0 m s−1​

Question

A car takes 100 metres to decelerate from 25 m s−1 to a complete stop.Which of the following describes all of the known variables in this situation?As=100 m,  u=25 m s1s=100\ \mathrm{m},\ \ u=25\ \mathrm{m\ s^{-1}}s=100 m,  u=25 m s−1​Bs=100 m,  u=25 m s1,  v=0 m s1s=100\ \mathrm{m},\ \ u=25\ \mathrm{m\ s^{-1}},\ \ v=0\ \mathrm{m\ s^{-1}}s=100 m,  u=25 m s−1,  v=0 m s−1​Cs=100 m,  v=25 m s1s=100\ \mathrm{m},\ \ v=25\ \mathrm{m\ s^{-1}}s=100 m,  v=25 m s−1​Ds=100 m,  v=25 m s1,  u=0 m s1s=100\ \mathrm{m},\ \ v=25\ \mathrm{m\ s^{-1}},\ \ u=0\ \mathrm{m\ s^{-1}}s=100 m,  v=25 m s−1,  u=0 m s−1​

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Solution

The correct answer is B.

In this situation, we know the initial speed (u) of the car, which is 25 m/s. We also know the final speed (v) of the car, which is 0 m/s because the car comes to a complete stop. Additionally, we know the distance (s) the car travels while decelerating, which is 100 m. Therefore, the known variables are s=100 m, u=25 m/s, and v=0 m/s.

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