acceleration unit review

What is the velocity of a ball that has been dropped off a cliff after 1 , 2, 3, 4, and 5 seconds? ( g is -9.8 m/s²)?.

• -9.8 m/s, -19.6 m/s, -29.4 m/s, -39.2 m/s, -49 m/s

• -4.9 m/s, -9.8 m/s, -14.7 m/s, -19.6 m/s, -25.5 m/s

• -5 m/s, -19.6 m/s, -44.1 m/s, -78.4 m/s, - 122.5 m/s

• The velocity is always -9.8 m/s².

What is the acceleration of a ball that has been dropped off a cliff after 1 , 2, 3, 4, and 5 seconds? ( g is -9.8 m/s²)?.

• -9.8 m/s, -19.6 m/s, -29.4 m/s, -39.2 m/s, -49 m/s

• -4.9 m/s, -9.8 m/s, -14.7 m/s, -19.6 m/s, -25.5 m/s

• -5 m/s, -19.6 m/s, -44.1 m/s, -78.4 m/s, - 122.5 m/s

• The acceleration is always -9.8 m/s².

Tags

NGSS.HS-PS2-1

Objects that are only under the influence of gravity are considered to be  ____

• in freefall
• flying
• in freefall only if they are moving downwards

Tags

NGSS.HS-PS2-4

Why does a car accelerate as it round a corner at a constant speed?

• Its direction changes
• It doesn't
• It slows down
• Its speeds up  

A problem that asks "how fast was the object going?" is prompting you for an answer measured in

• distance in meters.

• velocity in meters / second.

• acceleration in meters / second^2.

• time in seconds.

A problem that asks "how far did the object move?" is prompting you for an answer measured in

• distance in meters.

• velocity in meters / second.

• acceleration in meters / second^2.

• time in seconds.

A problem that asks "how long did it take" is prompting you for an answer measured in

• distance in meters.

• velocity in meters / second.

• acceleration in meters / second^2.

• time in seconds.

Kathy dropped a pebble from the deck of a bridge. The pebble impacted the river under the bridge after falling for 3.8 seconds.  Calculate the height of the bridge over the river.

• 37.2 m
• 70.7 m
• 141 m
• 18.6 m

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

Derek threw a penny downward from the deck of a bridge with a velocity of -4.6 m/s. The penny impacted the river below in 1.7 seconds. Calculate the final velocity of the penny at impact with the river.

• -16.7 m/s

• -21.3 m/s

• -12.1 m/s

• -24.5 m/s

Mack was skating to the park. He went 1.5 mi north, west for 0.75 mi, south 3 mi, and east 1.25 mi. What is Mack's total displacement?

• 1.58 mi NW

• 2.5 mi NE

• 1.58 SE

• 1.75 SW