kinematics

On a mysterious orb in a distant galaxy, some alien creatures conduct an experiment to verify the value of "g" on their planet. They drop a rock from the ceiling 2.7 meters high and record the time it takes to hit the ground to be 0.61 seconds. Find the value of "g"

• 7.3 m/s/s

• 14.5 m/s/s

• 9.8 m/s/s

• 11.8 m/s/s

A ball is thrown into the air. At the highest point, the ball has zero velocity and zero acceleration.

• True
• False

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

As a ball falls freely, the distance it falls each second is the same.

• True
• False

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.

Tags

NGSS.HS-PS2-4

Suppose an object is in free fall. Each second the object falls 

• the same distance as in the second before.
• a larger distance than in the second before.
• with the same instantaneous speed.
• with the same average speed.

Tags

NGSS.HS-PS2-4

A construction worker on a ladder is 2.2 meters off the ground when he throws a pencil horizontally at a speed of 3 m/s toward a fellow worker on the ground. How far from the ladder must the co-worker be in order to catch the pencil?

• 2 meters

• 4 meters

• 6 meters

• 8 meters