Question

please answer this fast. urgent​

Answer 1

Answer:

acc= average velocity/time taken

Explanation:

a-

acc= initial velocity -final velocity/ time taken

acc= 20-0/40

acc= 20/40=1/2m/s^2

b- it is uniform because equal distance is covered in equal interval of time

c- final velocity = initial velocity =20

acc= 20-20/40=0

d- acc is constant

Answer 2

Answer:

(a) 1/2 m/s²

(b) Because for every 10 seconds, the car increases its velocity by 5 m/s²

(c) (iv) zero

(d) (i) acceleration is constant

Explanation:

(a) Acceleration = change in velocity / time taken

                          = (v-u) divided by (t₂ - t₁) where v = final velocity

                                                                              u = initial velocity

                          = (20)/40

                          = 1/2 m/s²

(d) If the gradient is constant or the slope is straight, it means the acceleration is constant because it shows that the car is changing its velocity (precisely, increasing) at the same amount in a certain amount of time.

I'm not definitely sure about (a) since I ain't no math whizz but I hope this helped.