A solid sphere starts from rest and rolls without slipping a distance of 8 m down a roof that is inclined at 25˚. The roof’s edge is 5 m high from the ground. How far horizontally from the roof’s edge does the sphere hit the ground?

# Free-Fall and Projectile Motion

# A ball is thrown vertically upwards

A ball is thrown from ground level vertically upwards with an initial velocity of v_{i}. Draw a velocity-time graph of the ball’s motion. Consider collisions with the ground are absolutely elastic and neglect air resistance.

Image By Michael Maggs Edit by Richard Bartz – Own work, CC BY-SA 3.0, Link

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# A bomber wants to hit a target

# Shooting a bullet horizontally and dropping a bullet

# Two Stones

One stone is thrown upwards from a point on the ground with an initial velocity v_{1} and simultaneously another stone is dropped from a height. They reach the ground at the same instant. Compare the velocities which they have attained.

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# An airline passenger drops a coin

An airline passenger drops a coin while the plane is moving horizontally at 240 m/s. What is the velocity of the coin relative to the plane and relative to the Earth when it strikes the floor 1 m below its point of release?