2 D Motion

In the absence of air resistance, objects fall at a constant

• speed

• velocity

• acceleration

• all of the above

A ball is thrown upwards and caught when it comes back down. 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.

If you drop a feather and a coin at the same time in a tube filled with air, which will reach the bottom of the tube first?

• the feather
• neither
• the coin

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by

• about 5 m/s

• about 10 m/s

• about 15 m/s

• a variable amount

The more mass an object has, the faster it will fall in the absence of air resistance.

• True

• False

If you throw a baseball straight up, what is its acceleration at the highest point?

• 9.8 m/s² down

• 9.8 m/s² up

• 9.8 m/s

• 0 m/s

If you throw a baseball straight up, what is its velocity at the highest point?

• 9.8 m/s²
• 9.8 m/s
• 0 m/s²
• 0 m/s

What is the horizontal acceleration of a projectile?

• 0 m/s²

• -9.8 m/s²

• +9.8 m/s²

If a bullet is horizontally shot at the same moment another bullet is dropped from the same height, which has a larger vertical speed when they hit the ground?

• Shot Bullet
• Dropped Bullet
• Same for Both

An object is projected horizontally from a cliff.  The time it takes to hit the ground is

• more than if it was just dropped
• less than if it was just dropped
• the same amount of time than if it was just dropped
• impossible to determine