Answer:
 a = 12 m / s² 
Step-by-step explanation:
 Let's apply Newton's second law 
 F = m a 
where F is the force, m the mass of the body and the acceleration 
 
we clear 
 a = F / m 
 
let's calculate 
 a = 180/15 
 a = 12 m / s² 
 
this acceleration has the same direction of the force