acceleration=force divide by mass . How do you solve 20m/s2 =unknown divide by 0.15kg

Answer 1

a = F/m,
Multiply both sides by m:
F = ma = 0.15 * 20 = 3 N.

OR
a = F/m,
20 = F/0.15,
Solve for F:
F = 0.15*20 = 3 N.

Answer 2

40,000