Ann is driving down a street at 63 km/h. Suddenly a child runs into the street.
If it takes Ann 0.777 s to react and apply
the brakes, how far will she have moved before
she begins to slow down?
Answer in units of m

s = 13.6 m

Explanation:

Ann is driving at a constant speed. Hence, the formula of uniform motion shall be used here. The formula for the distance traveled during uniform speed motion is given as follows:

s = vt

where,

s = distance covered by the car before it begins to slow down= ?

v = uniform speed of car = (63 km/h)(1000 m/ 1 km)(1 h/3600 s) = 17.5 m/s

t = time to react before applying brakes = 0.777 s

Therefore, using the values in the equation, we get:

s = (17.5 m/s)(0.777 s)

s = 13.6 m

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.