find the meter to the following problem

Question

A passenger car is released from rest at the top of a free-fall ride. How far does the car fall in the first 2.5s, before braking is applied? Take upward as the positive direction and give your answer as a negative displacement, to the nearest meter.

a) -25m

b) -12m

c) -31m

d) -61m

Answer 1

Δy = 0.5 at² as it is initially at rest. If g = -10m/s² then

Δy = 0.5•(-10)•(2.5)² = -31.25 = -31 m

Answer c