20
10
The graph shows the speed, v metres per second (m/s),
of a bus at time t seconds.
Speed
a) Find the speed of the bus
(m/s)
at t = 8.
10m/s
[1]
b) Javeed claims that the bus
accelerated from 0 to 50 miles
per hour in the first 10 seconds.
Time (s)
Is he correct?
c) Use the graph to estimate the
Show your reasoning.
acceleration at t = 8.
Use 1 mile = 1.6 kilometres.
[3]
d) The speed of the bus is directly
proportional to the square of the time.
Find a formula linking v and t.
0
0
5
6
7
8
1
9
10