A cyclist, working at a constant rate of $400{\text{ }}W$, travels along a straight road which is inclined at ${2^ \circ }$ to the horizontal. The total mass of the cyclist and his cycle is 80 kg. Ignoring any resistance to motion, $80{\text{ }}kg$. Ignoring any resistance to motion, find, correct to 1 decimal place, the acceleration of the cyclist when he is travelling
a) uphill at $4{\text{ }}m{\text{ }}{s^{ - 1}}$,
b) downhill at $4{\text{ }}m{\text{ }}{s^{ - 1}}$.
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