1) Peter and Susan both stand at the edge of a tall building.

Susan throws a stone vertically downwards and, at the same time, Peter throws a stone upwards at an angle of 30º to the horizontal. The speed v with which both stones are thrown is the same.

Neglecting air resistance, which one of the following statements is true?

2) A projectile is fired with an initial speed of 51.2 m s^–1 at angle 44.5º above the horizontal on a long flat firing range. Point A is the maximum height attained by the projectile.
What is the vertical component of the velocity and location of the projectile 1.50 s after firing?

3) An aeroplane, flying in a straight line at a constant height of 500 m with a speed of 200 m s^–1, drops an object. The object takes a time t to reach the ground and travels a horizontal distance d in doing so. Taking g as 10 m s^–2 and ignoring air resistance, which one of the following gives the values of t and d?

4) A ball is thrown horizontally at a speed of 25 m/s from the top of a cliff.

If the ball hits the ground 4.0 s later, how high is the cliff?

5) A cannon fires a cannonball with an initial speed v at an angle α to the horizontal.

Which equation is correct for the maximum height H reached?