Question

1. what is the acceleration of the car that starts from rest and accelerates uniformly over a time of 14.17 s for a distance of 110 m?

2. an object is thrown straight down from the top of the building at the speed of 67.1 m/s. It hits the ground with a speed of 98.3 m/s.


a)How high is the building?
b)How long was the object in the air?

Answer 1

Answer:

12.10 m s−2.

a)61.22 m

b)2.04 sec

Explanation:

a) v^2 - u^2 = 2*a*h

40^2 - 20^2 = 2*9.8 * h

1200/2* 9.8 = h

h = 61.22 m

b) v = u +a*t

t = (40-20)/9.8

t=2.04 sec.

Explanation: