Kinematics

A clock shows twenty minutes past nine o'clock.
The diameter of the inner circle is d
The minute hand is observed at the time shown above and then again, 30 minutes later. For the end point P, what are the magnitudes for the distance and the displacement during this time interval?

• distance moved:

   $\frac{\pi d}{2}$  

  displacement magnitude:

   $\frac{d}{2}$  
  

• distance moved: $\frac{\pi d}{2}$  displacement magnitude: d

• distance moved:d:

   displacement magnitude: $\frac{\pi d}{2}$  

• distance moved: $\frac{d}{2}$  displacement magnitude: $\frac{\pi d}{2}$  

What is the magnitude of her displacement from point X

to point Y?

Give your answer in metres.

An ant walks halfway around the rim of a circular plate of diameter 10 cm in 20 s . What are the values of its average speed and magnitude of average velocity?

• Option i

• Option ii

• Option iii

• Option iv

A ball is launched horizontally at a vertical wall at 15 m⋅s−1 (to the right) and strikes the wall, before bouncing back along the same path at −10 m⋅s−1 (to the left). The ball was in contact with the wall for 25 ms. What is its average acceleration during contact with the wall?

• -1 ms^-2

• -200 ms^-2

• -0.2 ms^-2

• -1000 ms^-2

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2