Answer:
a = 0.175 m/s^2
Step-by-step explanation:
From newtons eauations of motion we know
v=u+at
here v= final velocity, u= initial velocity, a = acceleration, t= time
u = o( initialy object must be at rest)
therefore, 3.5 = 0+ a(20)
⇒ a = 3.5/20 =0.175 m/s^2