Revision HWK Eqn of Motion, Freefall, Refraction G10

An airplane accelerates down a runway at 3m/s² for 30s until is finally lifts off the ground. Determine the distance traveled before takeoff.

• 110 m

• 1350 m

• 1260 m

• 0 m

A car starts from rest and accelerates uniformly over a time of 25 seconds for a distance of 1100 m. Determine the acceleration of the car.

• 100 m/s²

• 0.88 m/s²

• 9.20 m/s²

• 3.5 m/s²

A race car accelerates uniformly from 18.5 m/s to 46.1 m/s in 2.47 seconds. Determine the acceleration of the car and the distance traveled.

• a = 11.2 m/s/s and d = 79.8 m

• a = 110 m/s/s and d = 89.8 m

• a = 5.55 m/s/s and d = 1.66 m

• a = 2.12 m/s/s and d = 266 m

It was once recorded that a Jaguar left skid marks that were 290 m in length. Assuming that the Jaguar skidded to a stop with a constant acceleration of -3.90 m/s2, determine the speed of the Jaguar before it began to skid

• vi = 47.6 m/s

• vi = 625 m/s

• vi = 2.67 m/s

• vi = 7.88 m/s

A feather is dropped on the moon from a height of 1.40 meters. The acceleration of gravity on the moon is 1.67 m/s2. Determine the time for the feather to fall to the surface of the moon.

• t = 1.72 s

• t = 2.55 s

• t = 2.22 s

• t = 1.29 s

What is the initial velocity of an object that starts from rest?

• -9.81 m/s

• 0 m/s

• 1.0 m/s

• cannot be determined

A rock is thrown straight up into the air at 20.0 m/s. What is the rock’s velocity if it returns back to the same initial height?

• 0 m/s

• 9.81 m/s

• -9.81 m/s

• -20.0 m/s

The Empire State Building in New York City is 381 m tall to the highest observation floor. If you could drop an object from the observation floor and have it fall freely to the ground WITH NO AIR RESISTANCE, what final velocity would the object have just before it hit the ground?

An object which is dropped from a height like the 381 m to the observation floor of the Empire State Building will never really keep accelerating at -9.81 m/s² due to _______ ________________.

Tags

NGSS.HS-PS2-1

When light passes at an angle to the normal from one material into another material in which its speed is higher 

• it is bent toward the normal.
• it always lies along the normal.
• it is unaffected.
• it is bent away from the normal.

Tags

NGSS.MS-PS4-2