Question

A car traveling 23 m/s begins to decelerate at a constant rate of 5 m/s2. After how many seconds does the car come to a stop

Answer 1

The time elapsed when the car comes to complete stop is 4.6 s.

The given parameters;

• initial velocity of the car, $v_0$ = 23 m/s
• acceleration of the car, a = - 5 m/s²

The time elapsed when the car comes to complete stop is calculated as follows;

$v_f = v_0 + at$

where;

$v_f$ is the final velocity of the car when it comes to a complete stop

$0 = 23 + (-5)t\\\\0 = 23 - 5t\\\\5t = 23\\\\t = \frac{23}{5} \\\\t = 4.6 \ s$

Thus, the time elapsed when the car comes to complete stop is 4.6 s.

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