Equation of Motion 9th

What are the three kinematic equations used to describe motion?

• v = u + at, s = ut + 0.5at^2, v^2 = u^2 + 2as

• v^2 = u^2 + at

• s = vt + 0.5at^2

• v = u + t^2

What is the acceleration due to gravity on Earth?

• 9.81 m/s^2

• 8.91 m/s^2

• 10.25 m/s^2

• 6.67 m/s^2

How does the acceleration due to gravity affect the motion of an object?

• The acceleration due to gravity causes the object to accelerate sideways

• The acceleration due to gravity has no effect on the motion of an object

• The acceleration due to gravity causes the object to decelerate upward

• The acceleration due to gravity causes the object to accelerate downward at a rate of 9.81 m/s^2, affecting its speed and direction of motion.

Explain the concept of free fall motion.

• Free fall motion is the motion of an object where magnetic force is the only force acting upon it.

• Free fall motion is the motion of an object where air resistance is the only force acting upon it.

• Free fall motion is the motion of an object where gravity is the only force acting upon it.

• Free fall motion is the motion of an object where friction is the only force acting upon it.

What is the velocity of an object in free fall after 3 seconds?

• 15.67 m/s

• 25.34 m/s

• 29.43 m/s

• 20.91 m/s

How far does an object fall in 5 seconds during free fall?

• 100 meters

• 122.625 meters

• 50 meters

• 75 meters

What is the final velocity of an object dropped from rest after 4 seconds of free fall?

• 45.67 m/s

• 20.12 m/s

• 39.24 m/s

• 30.98 m/s

Calculate the acceleration of an object in free fall if it reaches a final velocity of 30 m/s after 6 seconds.

• 10 m/s^2

• 15 m/s^2

• 20 m/s^2

• 5 m/s^2

A ball is dropped from a height of 100 meters. How long does it take to reach the ground during free fall?

• 4.5 seconds

• 6 seconds

• 8 seconds

• 2.5 seconds

An object is thrown vertically upwards with an initial velocity of 20 m/s. How long does it take to reach the highest point?

• 2.8 seconds

• 3.2 seconds

• 1.5 seconds

• 2.04 seconds