Free Fall and Projectile Motion

At what point is v_y= 0 m/s?

• A

• B

• C

• D

• None of these points

What is the vertical velocity of a ball that has been dropped off a cliff after 1 , 2, 3, 4, and 5 seconds? (assume g is rounded to 10 m/s²)?.

• 10, 20, 30, 40, 50 m/s

• 5, 10, 15, 20, 25 m/s

• 5, 20, 45, 80,125 m

• 10,10,10,10,10 m/s

What is the acceleration of a ball that is dropped off the side of a cliff after 1,2,3,4,5 seconds? (assume g is rounded to 10 m/s²)

• 5,10,15, 20, 25 m/s²

• 10, 20, 30, 40, 50 m/s²

• 5, 20, 45, 80, 125 m/s²

• 10,10,10,10,10 m/s²

When the velocity of an object does not change, what happens to its acceleration?

• Nothing, it does not accelerate.

• It is constant acceleration

• It is changing acceleration

• Need more information to determine

When an object falls in physics world, what happens?

• It accelerates at a constant rate until it hits the ground
• It accelerates at a non-constant rate until it hits the ground
• It accelerates at a constant rate until it reaches terminal velocity
• It accelerates at a non-constant rate until it reaches terminal velocity

A ball is thrown upwards and caught when it comes back down at the same height. In the absence of air resistance, the speed of the ball when caught would be

• less than the speed it had when thrown upwards.

• more than the speed it had when thrown upwards.

• the same as the speed it had when thrown upwards.

• need more information to determine.

A freely falling object starts from rest. After falling for 6 seconds, it will have a speed of about:

• 6m/s

• 36m/s

• 60m/s

• 12m/s

A 2-dimensional vector has _____________ and ___________ components.

• horizontal; vertical

• positive; negative

• superficial; deep

• long; short

• adjacent leg / hypotenuse

• opposite leg / hypotenuse

• adjacent leg / opposite leg

• opposite leg / adjacent leg

• opposite leg / hypotenuse

• adjacent leg / hypotenuse