Ten questions. The result tells you which lessons you may skip.
The momentum of a body along a line is \(p = 3t^2 + 2\), with \(p\) in kg m/s and \(t\) in seconds. The net force on it at \(t = 1\,\text{s}\) is
A \(2\,\text{kg}\) ball moves east at \(3\,\text{m/s}\), and another \(2\,\text{kg}\) ball moves north at \(3\,\text{m/s}\). The size of their total momentum is about
Blocks of \(1\,\text{kg}\) and \(3\,\text{kg}\), joined by a spring, lie on a smooth floor. A steady \(8\,\text{N}\) force pulls one of them. The acceleration of their centre of mass is
Blocks of \(2\,\text{kg}\) and \(6\,\text{kg}\) rest on a smooth floor and are pushed apart by a spring. The \(6\,\text{kg}\) block moves off at \(1\,\text{m/s}\). The \(2\,\text{kg}\) block moves at
A shell bursts in mid-air while gravity acts on it. Its momentum is conserved across the burst because
A \(3\,\text{kg}\) gun fires a \(15\,\text{g}\) bullet at \(600\,\text{m/s}\). The recoil speed of the gun is
A \(40\,\text{kg}\) child runs off the back of an \(80\,\text{kg}\) cart at rest on a smooth floor, at \(3\,\text{m/s}\) relative to the cart. The child's speed over the floor is
A block slides down a smooth wedge that stands free on a smooth floor. For the block and the wedge together,
A rocket in free space starts from rest with an exhaust speed of \(2000\,\text{m/s}\). When it has burnt half its starting mass, its speed is about
A uniform chain of weight \(W\) is released with its lower end just touching a table. Just before its last link lands, the table pushes up with