(a)[2]
Distinguish, in terms of their properties, between scalar quantities and vector quantities.
(b)[1]
In the list below, underline every scalar quantity. acceleration, force, kinetic energy, mass, power, weight
(c)
A stone is projected horizontally at $20\,\text{m s}^{-1}$ from the top of a cliff that is $15\,\text{m}$ high. The trajectory is shown in Fig. 1.1. Air resistance is negligible. For this stone:
(c(i))[2]
calculate the time taken to fall $15\,\text{m}$.
(c(ii))[3]
calculate the magnitude of the resultant velocity after the stone has fallen $15\,\text{m}$.
(c(iii))[2]
Describe how the stone’s displacement differs from the distance it travels.