Projectiles

A sphere of mass $m$ falls with speed $v$. The resistive force on the sphere is $kv$, where $k$ is a constant. What is the terminal speed of the sphere?

A coin is projected horizontally from the top of a desk. The diagram shows the coin at one point in its path. The air resistance is negligible. The arrows E, F and G represent different directions. Which row gives the direction of the acceleration and the direction of the momentum of the coin at this point?

Two ball bearings X and Y are projected from horizontal ground at the same time. X has mass $2m$ and is projected vertically upwards with speed $u$. Y has mass $m$ and is projected at 30° to the horizontal with speed $2u$. Air resistance is negligible. Which statement is correct?

Three objects U, V and W leave the edge of a bench at the same time. The objects fall in the same vertical plane with negligible air resistance. U is released from rest so that it falls vertically. V and W are projected horizontally. The paths of the three objects are shown. Which statement is correct?

An object is thrown vertically upwards at time $t = 0$. The object reaches its maximum height when $t = T$ and reaches its terminal speed on the way down. The magnitude of the object's acceleration is $a$. Which graph shows the variation of $a$ with $t$?