Physics Chapter 3 - Linear Motion

Compared with hang time on Earth, hang time on the Moon would be

• the same

• greater

• less

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A cart changes its speed from 90 m/s to 100 m/s in 10 seconds. During this interval its acceleration is

• 1 m/s²

• zero

• 10 m/s²

• none of the above

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You're at rest in a hammock when a hungry mosquito sees an opportunity for lunch. A mild 2-m/s breeze is blowing. If the mosquito joins you for lunch it should hover over you by flying

• with the breeze at 2 m/s

• against the breeze at 2 m/s

• a bit faster than wind speed

• none of the above

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The muzzle velocity of a bullet fired from a new rifle is 100 m/s. Neglecting air resistance, at the end of one second a bullet fired straight up into the air will have traveled a distance

• (100 - 5)m

• (100 + 5)m

• 5 m

• 100 m

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Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?

• 10 m/s²

• 40 m/s²

• 0.25 m/s²

• 4.o m/s²

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A river 100 m wide flows due south at 1 m/s. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat reaches the east bank

• 100 m farther south

• 141 m farther south

• due east of its starting point

• none of the above

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always

• directed upward

• directed downward

• opposite its velocity

• none of the above

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A ball is projected 125 meters straight upward and then falls the same distance back to its starting point. Neglecting air resistance, its total time in the air is about

• 15 s

• more than 20 s

• 5 s

• 10 s

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, one second later the rock's speed is

• 5 m/s

• zero

• 15 m/s

• 10 m/s

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One half second after starting from rest, a freely falling object will have a speed of about

• 10 m/s

• 2 m/s

• 5 m/s

• 20 m/s

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