Question

a car is moving at 60ms-1 it caused to stop in 3 seconds the average deceleration in ms-2 is__________.
a.-20
b.21
c.20
d.-21
who ever answers first and write will be the brainliest.

if you to give explanation properly theneven you are late I will mark your the brainliest..​

Answer 1

Answer:

u = 60, V = 0; t =3

v= u + at

a =( v-u)/t = -60/3 = - 20

so

a is right

Answer 2

Answer:

c) is answer

Explanation:

average deceleration = (initial velocity - final velocity)/ time taken

= 60-0/3= 20 m/s^2

Now understand,

here deceleration is asked therefore we have taken initial velocity - final velocity ,

suppose if acceleration was asked then we would have taken (final - initial velocity) and answer would be -20.

But deceleration is 20 m/s^2