Question

A car moving with constant acceleration covers the distance between two points 180 m apart in
6 sec. Its speed as it passes the second point is 45 m/s. What is its acceleration and its speed at the
first point
1) -5 m/s2, 15 m/s 2) -15 m/s2, 5 m/s 3) -5 m/s2; -15 m/s 4) 5 m/s2; 15 m/s​

Answer 1

Answer:

4) 5 m/s2; 15 m/s​

Explanation:

V=45 m/s

u=?

a=?

S=180m

T=6 s

We know that

V=u + at

45=u+6a. . Equation 1

By second equation of motion

S=ut +1/2at^2

180=6u +18a equation 2

Solving one and 2 we get

U=15

A=5