Question

question 3
a car with a mass of 1,500 kg is traveling at a speed of 30 m/s. what force must be applied to stop the car in 3 seconds?
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Explanation:

Step1: Calculate acceleration

The car's final velocity $v_f=0$ m/s, initial velocity $v_i=30$ m/s, time $t=3$ s. Use $a=\frac{v_f-v_i}{t}$.
$a=\frac{0-30}{3}=-10$ m/s²

Step2: Calculate applied force

Use Newton's second law $F=m \times a$, mass $m=1500$ kg.
$F=1500 \times (-10)$

Answer:

$-15000$ N (the negative sign indicates the force acts opposite to the car's motion)