Answer:
3.92 m/s²
Step-by-step explanation:
It's hard to read your sketch, but it looks like m2 = 30 kg? If so, here's the answer:
m1 = 20 kg
m2 = 30 kg
a = (m2·g) - (m1·g·sin∅) / (m1 + m2) you can see how this equation is derived from Newton's 2nd Law in any physics textbook or website
a = ((30 kg)(9.8 m/s²) - (20 kg)(9.8 m/s²)(sin30)) / (20 kg + 30 kg)
a = (294 kg·m/s² - 98 kg·m/s²) / (50 kg) = 3.92 m/s²