Question
Correct your friend who says, “The dragster rounded the curve at a constant velocity of 100 km/h.”
Step 1
Speed is a scalar quantity that refers to "how fast an object is moving," while velocity is a vector quantity that refers to "the rate at which an object changes its position." In other words, velocity is speed in a given direction. Show more…
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Dragsters can actually reach a top speed of $145.0 \mathrm{m} / \mathrm{s}$ in only $4.45 \mathrm{s}$. (a) Calculate the average acceleration for such a dragster. (b) Find the final velocity of this dragster starting from rest and accelerating at the rate found in (a) for $402.0 \mathrm{m}$ (a quarter mile) without using any information on time. (c) Why is the final velocity greater than that used to find the average acceleration? (Hint: Consider whether the assumption of constant acceleration is valid for a dragster. If not, discuss whether the acceleration would be greater at the beginning or end of the run and what effect that would have on the final velocity.)
What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 s? (Why do some of your classmates who correctly answer the preceding question get this question wrong?)
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