Physics, 2D Motion, Post Assessment

A hiker backpacks to a waterfall that is 1500 m east and 2000 m north of his starting position. What is the magnitude of his displacement? Use an order-of-magnitude estimation to choose the correct answer.

• 1323 m
• 500 m
• 3500 m
• 2500 m

If you know the length of both legs of a right triangle, which operation would be the correct one to find the acute angles?

• tan^-1 |a/b|
• tan^-1 |a|
• tan |a|
• tan |a/b|

Resolve the vector L into components L_x and L_y if the length of vector L is 15.0 m and its reference angle is 20°.

• L_x = +14.1 m, L_y = +5.13 m
• L_x = +14.0 m, L_y = +5.00 m
• L_x = +14.2 m, L_y = +5.20 m
• L_x = +13.9 m, L_y = +5.10 m

If a boomerang is thrown 20 m in a straight line and returns exactly to the spot it was thrown what is its displacement?

• 20m
• 40m
• 0m
• -20m

If a car moves 12 km North, 19 km East, and 12 km South, what is its displacement?

• 12 km
• 19 km, East
• 31 km
• 43 km, East

A car travels 90 meters due north in 15 seconds. Then the car turns around and travels 40 meters due south.  What is the magnitude and direction  of the car's resultant displacement?  

• 40 metres, South
• 50 metres, South
• 50 metres, North
• 40 metres, North 

Tags

CCSS.HSN-VM.B.4C

Find the missing side. 

• 15.6
• 12.1
• 8
• 5.25

 Ray runs 30 feet north, 30 feet west, and then 30 feet south. What is the distance?

• 90 feet
• 30 feet
• 60 feet
• 0 feet

The horizontal component of a projectile's velocity is:

• constant 
• a constant acceleration
• always -9.8 m/s² down

When a projectile is at the highest point of its path, the vertical velocity is:

• Constant
• Always -9.8 m/s²
• Zero