Equations of motion

A roller coasters accelerates from an initial velocity of 6.0 m/s to a final velocity of 70 m/s over 4 seconds.  What's the acceleration?

• 24 m/s²
• 18 m/s²
• 16 m/s²
• 16 m/s

Dave runs a 400 m race with a speed of 4 m/s. How long will it take him to finish the race?

• 1600 s

• 100 min

• 100 s

• 0.025 s

A dog runs with an initial speed of 7.5 m/s on a waxed floor.  It slides to a stop in 15 seconds.  What is the acceleration?

• -7.5 m/s
• -7.5 m/s²
• -0.5 m/s²
• 7.5 mi//hr

Car A is traveling to the right with a speed of 29​​m/s when the rider slams on the accelerator to pass car B. Car A passes car B in 110 m with constant acceleration and reaches a speed of 34m/s. We want to find the acceleration of the car as it speeds up. What equation should you choose?

• v_f=v_i+at

• Δx=v_it+1/2at²

• v_f²=v_i²+2aΔX

• Δx=((v_f+v_i)/2)t

An airplane accelerates down a runway at 3.20 m/s² for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.

Which equation is appropriate?

• v_f=v_i+at

• Δx=v_it+1/2at²

• v_f²=v_i²+2aΔX

• Δx=((v_f+v_i)/2)t

Kinematic equations (aka Equations of uniform motion) can only be used when you have a constant ....

• Position

• Velocity

• Acceleration

• Time

A golf ball starts with a speed of 2 m/s and slows at a constant rate of 0.5 m/s², what is its velocity after 2 s?

• 0 m/s
• 0.5 m/s
• 1 m/s
• 1.5 m/s

An satellite which is moving at constant speed in orbit around the Earth has an acceleration...

• True

• False

A golf ball accelerates off a tee at 15m/s², changing its velocity from 0m/s to 50 m/s down the fairway. How long did it take the golf ball to accelerate?

• 750 seconds
• 35 seconds
• 0.3 seconds
• 3.3 seconds

Car A is traveling to the right with a speed of 29​​m/s when the rider slams on the accelerator to pass car B. Car A passes car B in 110 m with constant acceleration and reaches a speed of 34m/s. What is the acceleration of car A?

• 1.43m/s²

• 9.07m/s²

• 34m/s²

• 0.04m/s²