Question

4. A moving car stopped and then starts accelerating uniformly at the rate of 3 ms-2. The speed of car after 20 seconds is

Answer 1

Answer: 60 m/s

Step-by-step explanation:

We would apply one of Newton's formula of motion which is expressed as

v = u + at

where

v is the final velocity

u is the initial velocity

a is the acceleration

t is the time

From the information given,

a = 3

u = 0 because it started from rest

t = 20

v?

Thus,

v = 0 + 3 x 20

v = 60 m/s

The speed of car after 20 seconds is 60 m/s