how long do you take?
90 = 8 t
t = 11.25 seconds
8 = 1.20 v
v = 6.67 m/s
so
90 = 6.67 t
t = 13.5 s
so you should start 13.50 - 11.25
= 2.25 seconds after him
You can run 8.0 m/s , 20% faster than your brother. How much head start should you give him in order to have a tie race over 90 m ?
1 answer