Physics Quiz 7 - Projectile Motion (Acceleration)

A runner decreases his velocity from 20 m/s to 10 m/s in 2.0 s. What was his average acceleration?

• -5.0 m/s ^2

• 5.0 m/s ^2

• -7.5 m/s ^2

• -10.0 m/s ^2

Tags

NGSS.HS-PS2-1

An automobile slows from 26 m/s to 18 m/s. Its acceleration is −2.0 m/s^2. How much time does it take for the vehicle to slow down?

• 4.0 s

• -4.0 s

• 8.0 s

• 9.0 s

Tags

NGSS.HS-PS2-1

If an automobile slows from 26 m/s to 18 m/s in a period of 4.0 s, what was the average acceleration?

• -2.0 m/s^2

• 2.0 m/s^2

• -4.0 m/s^2

• -8.0 m/s^2

If the acceleration of a motorboat is 4 m/s2 and the motorboat starts from rest, what is its velocity after 6 seconds?

• 24 m/s

• 10 m/s

• 14 m/s

• -4 m/s

A boat sailing against the current experiences a negative acceleration of 11 m/s2. If the boat’s initial velocity is 44 m/s upstream, how long until it comes to a stop?

• 4 s

• 9.8 s

• 4.4 s

• 12 s

A boat's initial velocity is 30 m/s. After 2.5 seconds, its velocity is 5 m/s. What is the boat's rate of acceleration?

• -10 m/s^2

• -5 m/s^2

• 10 m/s^2

• -6 m/s^2

A ball is thrown into the air. At the moment the ball has reached its highest location, the ball has zero (a)  

with non-zero acceleration.