Answer:
[tex]20\ m/s[/tex]
Explanation:
Since we are given time, acceleration, and final velocity, we can use the following formula to find the initial velocity:
[tex]v_f = v_i + at[/tex]
Our given values:
[tex]v_f = 0\\a = -2\\t = 10\\[/tex]
Acceleration is negative because the car is slowing down.
Add the values to the formula, and solve for [tex]v_i[/tex]:
[tex]v_f = v_i + at\\0 = v_i + (-2)(10)\\0 = v_i -20\\20 = v_i[/tex]
