Imat 2022 question 53 physics

[Nirvana]

Hi can anyone answer this question for me?

[Lavanya]

u=2.0ms-1
v=0
s=2.0m
v^2-u^s=2as
0-4=2a2
-4/4=a
a = -1ms-^2
Force = massaccelaration
Since, force is resistive it will be negative
-4N= mass*-1ms^-2
-4N/-1ms-^2=mass
mass=4 Kg

[Lavanya]

you took initial velocity as 0 whereas final velocity should be zero
the expression is v^2 -u^2 =2as
where v is final velocity and u is initial velocity

[Nirvana]

Thank you so much .