Question 6
A cyclist travels for 8 s at a uniform speed of 15 m s-1. What distance do they cover?
The right answer is the one marked above.
120 m. Rearranging speed = distance ÷ time gives distance = speed × time:
distance = 15 m s-1 × 8 s = 120 m
Checking the units confirms it: m s-1 × s = m. 15 m is the distance covered in one second only; 23 m is what you get by adding instead of multiplying.