2.1 Motion

An object is released from a stationary hot air balloon at height s above the ground. Air resistance is negligible. 

An identical object is released at the same height above the ground from another balloon that is rising at a constant speed.

Which of the following does not increase for the object released from the rising balloon? 

An object is projected in a vacuum chamber and in a playing field (where air resistance is taken into account). Otherwise, all initial conditions are equivalent. 

Which graph shows correct trajectory for the object in the vacuum chamber and in the playing field? 

A projectile is fired from level ground with speed v at an angle θ to the ground. Ignoring air resistance, which of the following is a correct expression for the maximum height reached by the projectile?

An object is dropped from height and falls through air of uniform density. 

Which of the following is the correct acceleration-time graph for the object? 

An object is thrown vertically upwards from the top of a cliff. It then falls directly below into the sea. 

The graph shows the vertical component of velocity v varies with time t.

How high is the cliff-top from the surface of the sea? 

Baseball player Y throws a ball to baseball player X as shown. 

What is the direction of the net force on the ball at the instant shown, if air resistance is not neglected? 

On a clear day, in the absence of air resistance, a cannon ball is fired at an angle θ to the ground with an initial velocity u. Its horizontal range is s. Which of the following statements is incorrect? 

A body of mass m is projected at an angle φ to the horizontal in a gravitational field. Its trajectory is parabolic and follows the path PQRST. These points are the position of the body along its trajectory at equal time intervals, with T being the object's maximum height. 

The displacements PQ, QR, RS and ST are:

A small uniform bob is attached to a simple pendulum, and set into motion from some angular displacement. When the bob passes through the lowest point of its motion, the pendulum is cut. If, at this instant, the bob is moving with a speed of v m s^–1, at a height h above ground, how far away does the bob land from a position measured directly under the point at which the pendulum is cut?