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A semitruck is initially traveling eastward at 18 m/s when the driver slams on the brakes and brings the truck to a complete stop to avoid hitting a stalled car. If the semitruck decelerates uniformly at a rate of 4 m/s2, (A) How long (time) does it take for the semitruck to stop? (B) Calculate the truck’s instantaneous velocity v(t) after one (1) second. (C) Calculate the truck’s instantaneous velocity v(t) after three (3) seconds. (D) Calculate the truck’s change in velocity ∆v during the third (3rd) second. (E) Determine the ratio: ∆𝑣(𝑡=0→1 𝑠)=______∆𝑣(𝑡=1.2→2.9 𝑠) (F) If the initial speed is doubled, how would that affect the braking time?