Relative Motion, velocity, acceleration (HW)

It took Stephen 12 seconds to run across a grass field. Which additional information does he need in order to calculate his acceleration during the run?

• The direction he ran and the average speed

• The distance he ran and the average velocity

• The beginning speed and the direction he ran

• The beginning velocity and the ending velocity.

Tags

NGSS.HS-PS2-1

Tags

NGSS.HS-PS2-1

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When a person parachutes from a plane, she travels at about 67 meters per second. When she pulls her cord and her chute opens, she slows to about 3 meters per second. If the velocity and acceleration are both considered positive before the chute opens, how do her velocity and acceleration change when the chute opens?

• Velocity and acceleration both remain positive

• velocity and acceleration both become negative

• velocity remains positive but acceleration becomes negative

• velocity becomes negative but acceleration remains positive

Tags

NGSS.HS-PS2-1

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS2-1

John drove a truck for one hour at a rate of 80 kilometers per hour. The next hour, he drove at 100 kilometers per hour. What was his average speed during those two hours?

• 80 km/hr

• 90 km/hr

• 100 km/hr

• 180 km/hr

Jasmine coasts down one hill on her bicycle and then up a second hill until she stops. Which graph indicates Jasmine’s motion on the second hill?

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Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

NGSS.HS-PS3-1

A boat is moving at a speed of 7 m/s relative to the water. A dog walks from the front to the back of the boat at a speed of 2 m/s relative to the boat. What is the speed of the dog, in m/s, relative to the water?

• 3.5 m/s

• 5 m/s

• 9 m/s

• 14 m/s

A bicycle is traveling at 3 meters per second (m/s). The rider applies the brakes and stops the bicycle in 3 seconds. What is the average rate of acceleration of the bicycle during this time?

Tags

NGSS.HS-PS2-1

• MN

• NO

• OP

• PQ

Tags

NGSS.HS-PS2-1