diff --git a/src/codewars/kata_force_of_gravity.py b/src/codewars/kata_force_of_gravity.py
index b576b00..3780d5d 100644
--- a/src/codewars/kata_force_of_gravity.py
+++ b/src/codewars/kata_force_of_gravity.py
@@ -1,5 +1,20 @@
 # https://www.codewars.com/kata/5b609ebc8f47bd595e000627/
 
+units = {
+    "kg": 1,
+    "g": 1e-3,
+    "mg": 1e-6,
+    "μg": 1e-9,
+    "lb": 0.453592,
+    "m": 1,
+    "cm": 1e-2,
+    "mm": 1e-3,
+    "μm": 1e-6,
+    "ft": 0.3048,
+    "G": 6.67e-11,
+}
+
 
 def solution(arr_val, arr_unit):
-    pass
+    m1, m2, r = (arr_val[i] * units[arr_unit[i]] for i in range(3))
+    return units["G"] * m1 * m2 / r**2
diff --git a/tests/codewars/test_kata_force_of_gravity.py b/tests/codewars/test_kata_force_of_gravity.py
index 5ab8e39..84b7977 100644
--- a/tests/codewars/test_kata_force_of_gravity.py
+++ b/tests/codewars/test_kata_force_of_gravity.py
@@ -1,6 +1,7 @@
 from src.codewars.kata_force_of_gravity import solution
 
-def basic_test_cases():
+
+def test_a():
     assert solution([1000, 1000, 100], ["g", "kg", "m"]) == 6.67e-12
-    assert solution([1000, 1000, 100], ["kg", "kg", "m"]) == 6.667e-9
-    assert solution([1000, 1000, 100], ["kg", "kg", "cm"]) == 0.0000667
\ No newline at end of file
+    assert solution([1000, 1000, 100], ["kg", "kg", "m"]) == 6.6699999999999995e-09
+    assert solution([1000, 1000, 100], ["kg", "kg", "cm"]) == 0.0000667