New Arrivals

# IGCSE: Physics (0625)

### Q u e s t i o n

A digital stop-clock measures time in minutes and seconds.
The stop-clock reads 00:50 when it is started (i.e. 00 minutes 50 seconds).
It reads 02:10 when it is stopped.
What is the shortest possible time that has elapsed between starting and stopping the stop-clock?

A   1 minute 20 seconds
B   2 minutes 00 seconds
C   2 minutes 10 seconds
D   3 minutes 00 seconds

### Q u e s t i o n

A long-distance runner wishes to calculate her average speed for a race.
Which calculation should she use?

A   $$\text{average speed} = {\text{total time} \over \text{total distance}}$$
B   average speed = total distance × total time
C   $$\text{average speed} = {\text{total distance} \over \text{total time}}$$
D   average speed = total distance + total time