Answer:
1 second
Explanation:
Impluse is the product of force and time. Specifically the force over a time interval is know as impulse. From the second law of motion we get impulse being equal to the change in momentum.
u = Initial velocity = 2 m/s
v = Final velocity = 0
t = Time taken
F = Force applied = 4 N
[tex]Ft=m(v-u)\\\Rightarrow 4t=2(2-0)\\\Rightarrow 4t=4\\\Rightarrow t=\frac{4}{4}\\\Rightarrow t=1\ s[/tex]
Time the force has to be applied is 1 second.
