S T L

If the acceleration of an object is negative, the object must be slowing down.

• True

• False

When can we be certain that the average velocity of an object is always equal to its instantaneous velocity?

• only when the velocity is constant

• only when the acceleration is constant

• only when the acceleration is changing at a constant rate

• always

• never

A car accelerates from 5.0 m/s to 21 m/s at a rate of 3.0 m/s². How far does it travel while accelerating?

• 207 m

• 117 m

• 69 m

• 41 m

Tags

NGSS.HS-PS2-1

Which of the following situations is impossible?

• An object has constant non-zero acceleration and changing velocity.

• An object has zero velocity but non-zero acceleration.

• An object has constant non-zero velocity and changing acceleration.

• An object has velocity directed east and acceleration directed east.

• An object has velocity directed east and acceleration directed west.

Tags

NGSS.HS-PS2-1

A stone is thrown vertically upwards, reaches a highest point, and returns to the ground. When the stone is at the top of its path, its acceleration

• changes direction from upwards to downwards.

• is directed upwards.

• is zero.

• is directed downwards.

Tags

NGSS.HS-PS2-1