Question 1

A car travels 60 km in 1 hour, then 40 km in 0.5 hours. What is the average speed of the car for the entire trip?

Accepted Answer

$$66.7\ \mathrm{km/h}$$

Question 2

A biker starts at his camp and rides 5.2 km due east, then 3.8 km due north. What is the magnitude of his displacement?

Accepted Answer

$$6.4\ \mathrm{km}$$

Question 3

A stone is thrown directly upward with an initial speed of $$15\ \mathrm{m/s}. $$How long does it take to return to the thrower's hand? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$3.06\ \mathrm{s}$$

Question 4

A car accelerates uniformly from rest to $$20\ \mathrm{m/s} in$$ $$5\ \mathrm{s}. $$What is the acceleration?

Accepted Answer

$$4\ \mathrm{m/s^2$}$$

Question 5

A car on the highway slows down from $$22.4\ \mathrm{m/s} to $$rest in $$2.55\ \mathrm{s}. $$What is the magnitude of its acceleration?

Accepted Answer

$$8.78\ \mathrm{m/s^2$}$$

Question 6

A ball is thrown vertically upward with a speed of $$12\ \mathrm{m/s}. $$What is the maximum height it reaches? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$6.12\ \mathrm{m}$$

Question 7

A biker rides $$2.0\ \mathrm{km}$$ due east, then $$4.0\ \mathrm{km}$$ due north. What is the direction of his displacement from the starting point?

Accepted Answer

$$63.4^\circ$$ north of east

Question 8

A ball is dropped from a height of $$20\ \mathrm{m}. $$How long does it take to reach the ground? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.02\ \mathrm{s}$$

Question 9

Two forces act on an object: $$|\vec{F}_1| = 80\ \mathrm{N} at$$ $$60^\circ$$ above the x-axis, and $$|\vec{F}_2| = 120\ \mathrm{N}$$ along the x-axis. What is the magnitude of the resultant force?

Accepted Answer

$$170\ \mathrm{N}$$

Question 10

A car travels at $$30\ \mathrm{m/s}$$ for $$10\ \mathrm{s}$$, then at $$10\ \mathrm{m/s}$$ for $$20\ \mathrm{s}. $$What is the average velocity for the entire trip?

Accepted Answer

$$20\ \mathrm{m/s}$$

Question 11

A stone is thrown downward from a height of $$45\ \mathrm{m}$$ with an initial speed of $$5\ \mathrm{m/s}. $$How long does it take to hit the ground? (Assume $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$2.5\ \mathrm{s}$$

Question 12

A biker rides $$3.0\ \mathrm{km}$$ east, $$4.0\ \mathrm{km}$$ north, and $$2.0\ \mathrm{km}$$ west. What is the magnitude of his displacement?

Accepted Answer

$$4.5\ \mathrm{km}$$

Question 13

A car accelerates from $$10\ \mathrm{m/s} to$$ $$30\ \mathrm{m/s} in$$ $$4\ \mathrm{s}. $$What is the distance covered during this time?

Accepted Answer

$$80\ \mathrm{m}$$

Question 14

A ball is thrown straight up with a velocity of $$20\ \mathrm{m/s}. $$How long does it take to reach its maximum height?

Accepted Answer

$$2.04\ \mathrm{s}$$

Question 15

A biker rides $$6.0\ \mathrm{km}$$ north, then $$8.0\ \mathrm{km}$$ east. What is the magnitude of his displacement?

Accepted Answer

$$10.0\ \mathrm{km}$$

Motion in 1D and Vectors: Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드