Projectile Motion and Free Fall

A ball is dropped from a desk and last 0.12 seconds in the air. How fast was it going right before it hits the ground?

• 1.20 m/s

• 0.02 m/s

• 0.16 m/s

• 0.19 m/s

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A rock is dropped from a height and takes 0.30 seconds to reach the ground. What is the approximate height from which it was dropped?

• 0.15 m

• 0.44 m

• 0.20 m

• 0.90 m

Tags

NGSS.MS-PS2-4

A ball is thrown horizontally at 15 m/s from the top of a cliff 30 m high. How far from the cliff would the ball hit the ground?

• 2.47 m

• 37.12 m

• 31.26 m

• 25.64 m

Tags

NGSS.MS-PS2-4

A ball is thrown horizontally at 15 m/s from the top of a cliff 30 m high. How far from the cliff would the ball hit the ground?

• 2.47 m

• 37.12 m

• 31.26 m

• 25.64 m

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-2

A toy car rolls off a table horizontally at 2 m/s from a height of 0.8 m. How far from the base of the table does it land?

• 0.40 m

• 0.80 m

• 0.80 m

• 1.60 m

Tags

NGSS.MS-PS3-1

What equation should you use to answer the question:

"How long is it in the air?"

Answer explanation

Equations 1, 2 and 4 contain Y_f . Using them would leave us with one equation with two unknowns which we cannot solve.

A stone is thrown horizontally from a balcony at 10 m/s and lands 20 m away from the base. What is the height of the balcony?

• 10.2 m

• 19.6 m

• 20.4 m

• 15.3 m

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-2

A ball is dropped from a height of 2 m. How long does it take to reach the ground? (Assume g = 9.8 m/s²)

• 0.64 s

• 1.02 s

• 0.20 s

• 0.45 s

Tags

NGSS.MS-PS2-4

A marble rolls off a 1.5 m high table with a horizontal speed of 3 m/s. How far from the base of the table does it land?

• 2.34 m

• 1.66 m

• 0.85 m

• 3.00 m

Tags

NGSS.MS-PS3-1

What is the horizontal acceleration of a projectile?

• 0 m/s²
• -9.8 m/s²
• 0 m/s
• -9.8 m/s