The displacement of a car is a function of time as follows: x(t)=25+3.0t², with x is in meters. Find the average velocity between t1 = 1.0s and t2 = 4.0s.

15m/s

Explanation: Average Velocity is vector describing the total displacement of an object and the time taken to change its position. It is represented as:

At t₁ = 1.0s, displacement x₁ is:

x(1) = 28

At t₂ = 4.0s:

x(4) = 73

Then, average speed is

v = 15

The average velocity of a car between t₁ = 1s and t₂ = 4s is 15m/s

layer a is the exosphere and layer b is the thermosphere.   is the answer i think but i hope this .

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.