Question

Ann is driving down a street at 64 km/h.

Suddenly a child runs into the street.
If it takes Ann 0.761 s to react and apply
the brakes, how far will she have moved before
she begins to slow down?
Answer in units of m.

Answer 1

13.5 m

Step-by-step explanation:

First, convert km/h to m/s:

64 km/h × (1000 m / km) × (1 h / 3600 s) = 17.8 m/s

Distance = rate × time

d = 17.8 m/s × 0.761 s

d = 13.5 m

Answer 2

13.5 m

Step-by-step explanation:

64 km * 1000 m/km

-----------------------

1 hr * 3600 s/hr

= 17.8 m/s

d = vt

= (17.8 m/s)(0.761 s)

= 13.5 m