Question

A body of mass 2 kg, moving on a horizontal surface
with an initial velocity of 4 m/s, comes to rest after 2
seconds. If one wants to keep this body moving on
the same surface with a velocity of 4 m/s, the force
required is

Answer 1

is answer is 4N

Answer 2

how

Answer 3

yes

Answer 4

first, find acceleration of body is
what is the formula of acceleration of a body???

Answer 5

a=v-u/t

Answer 6

arent v & u both4?

Answer 7

no?

Answer 8

\[a=\frac{v-u}{t}\]
where u=4 m/s and v=0 m/s

Answer 9

find accleration?

Answer 10

why?
they are saying initial and final velocities should be same..i.e 4m/s it shouldnt change

Answer 11

no, your question said that initial velocity is 4 m/s( written in your question) and final velocity is 0 m/s(comes to rest) .
ok @DLS

Answer 12

Given
u=4 m/s
v=0 m/s
t=2 s
a=v-u/t
a=0-4/2
so find acceleration? can you @DLS

Answer 13

@DLS

Answer 14

oh dw I gt it!!

Answer 15

ok