Free fall- Equation of motion

A ball falls freely from rest for 5.0 s. calculate the ball’s velocity.

• –49 m/s

• –98 m/s

• 98 m/s

• 49 m/s

A stone is thrown vertically downwards with a velocity of 5.00 m/s. What is the stone’s speed 2.00 s after it is thrown?

• 10.0 m/s

• 15.0 m/s

• 20.0 m/s

• 25.0 m/s

An object is projected vertically upward from the ground with a velocity of 30 𝑚/𝑠. What is its time of the flight if it reaches back to the ground?

• 0.7 s

• 1.5 s

• 6.0 s

• 50s

A rock is dropped off a cliff and strikes the ground with an impact velocity of 20 m/s. How high was the cliff?

• 0.05 𝑚

• 10 𝑚

• 20𝑚

• 40 𝑚

Saeed throws a stone downward with a speed of 3.0 𝑚/𝑠 from a balcony. How high is the balcony from the ground if it takes the stone 1.0 𝑠 to reach the ground?

• 8.0 m

• 7.0. m

• 5.0 m

• 6.0 m