A car travels 50 km North and then returns 30 km South. The whole journey takes 2 hours. What is the distance travelled and the average speed?
80 km at 40 km per hour.
81 km at 35 km per hour.
53 km at 70 km per hour.
A girl delivers newspapers to three houses, X, Y and Z as shown in the diagram starting at X. The girls walks directly from on house to the next. Calculate the girl's final displacement from X.
50 m (065)
50 m (023)
50 m (037)
A model aircraft is flying north with a velocity of 24 metres per second. A wind is blowing from west to east at 10 metres per second. What is the resultant velocity of the plane?
27 m per second (020)
26 m/s (023)
24 m/s (025)