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?
Responda
80 km at 40 km per hour.
81 km at 35 km per hour.
53 km at 70 km per hour.
Questão 2
Questão
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.
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?
Responda
27 m per second (020)
26 m/s (023)
24 m/s (025)
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