An explorer is standing at the edge of a deep canyon, looking down at a river below.
The explorer throws a small radio transmitter horizontally from the canyon edge.
State the name of the curve that describes the path of the transmitter as it falls towards the river, neglecting air resistance.
State the direction of the resultant force acting on the transmitter while it is in the air.
Later, the explorer releases a small scientific probe and a heavy stone of the same size vertically from rest at the same time.
Comment on the times taken for the two objects to reach the river.
A geological survey team on the opposite side of the canyon, at a distance of 1020 m1020\text{ m}1020 m from the explorer, triggers a seismic signal using a small detonation.
The explorer drops a pebble vertically at the exact instant they see the light flash from the detonation, and the pebble hits the river at the exact instant the sound of the explosion is heard.
The speed of sound in the canyon is 340 m/s340\text{ m/s}340 m/s. Take the acceleration of free fall g=10 m/s2g = 10\text{ m/s}^2g=10 m/s2.
Calculate the time taken for the sound of the explosion to reach the explorer.
Calculate the speed with which the pebble hits the river.
204 exam-style questions on CIE IGCSE Physics Motion, covering Motion. Each one has a worked solution and a mark scheme showing where the marks go.