Kinematics , Free Fall

The length of the actual path an object moves is…

• distance

• speed

• velocity

• displacement

A motorcycles move with an initial velocity of It takes 10 s to accelerate to a velocity of 15 ms^-1. What is the acceleration of the motorcycle?

• 0.5 ms^-2

• 1.0 ms^-2

• 1.5 ms^-2

• 2.0 ms^-2

When an object is accelerating, the ___________ of an object will change.

• speed

• mass

• force

• velocity

Which of the following correctly describes what happens during a free fall?

• Kinetic energy is converted to potential energy.

• Velocity is constant.

• Acceleration is constant.

• Acceleration increases with the fall.

Adam finished 100 m race in a time of 8.7 s. What was his average speed?

• 18.7 ms^-1

• 11.5 ms^-1

• 10.0 ms^-1

• 4.4 ms^-1

When velocity is constant, the acceleration is …

• zero

• increasing constantly

• decreasing constantly

• will increasing and after a few second it will decreasing

A ball is thrown upward in the air with an initial velocity of 40 m/s. How long does it take to reach back to the point it was thrown from?

• 4 s

• 6 s

• 2 s

• 8 s

When an object falls in physics world, what happens?

• It accelerates at a constant rate until it hits the ground

• It accelerates at a non-constant rate until it hits the ground

• It accelerates at a constant rate until it reaches terminal velocity

• It accelerates at a non-constant rate until it reaches terminal velocity

A freely falling object starts from rest. After falling for 6 seconds, it will have a speed of about

• 6 m/s

• 60 m/s

• 30 m/s

• 300 m/s

An object free falls for 3.5 seconds. How far does it fall?

• 120.05 m

• 60.03 m

• 17.15 m

• 34,3 m