Answer:
The minimun distance to the Cobra should be about 3.5 [m]
Explanation:
This problem can be solved using kinematics equations, and by means of the following equation:
v = x/t
where:
v = velocity = 3.5 [m/s]
t = time = 1 [second]
x = distance of the attack
x = 3.5*1 = 3.5 [m]
