Question

a car moving with a velocity of 10 ms and uniform acceleration gains a velocity of 30 ms after travelling a distance of 4 km.The time taken is

Answer 1

Answer:

U = 10m/sU = 10m/s

V = 40m/s

S = 4000m

V^2 - U^2 = 2AS

1600 - 100 = 2*A*4000

1500=8000A

A=3/16m/s^2

T=V-U/A

=40-10/(3/16)

=30*16/3

=160seconds

Answer 2

Answer:

20seconds

Explanation:

Whenever you're attempting questions from kinematics try to take out all the data provided to you.

In the given question ,

u = 10m/s

a = a(uniform acceleration )

v = 30m/s

s= 4000m (converted into metres )

now using the equation v^2 = u^2+ 2as

we get

9000= 1000 + 8000a

this gives a = 1m/s

now time taken can be calculated by

v= u + at

30= 10 + 1t

t = 20seconds .

hope it helped.