Add operator Acceleration times Duration (#987)

Author: WinterWonderland

UnitsNet.Tests/CustomCode/AccelerationTests.cs

@@ -43,5 +43,12 @@ public void AccelerationTimesDensityEqualsSpecificWeight()
             SpecificWeight specificWeight = Acceleration.FromMetersPerSecondSquared(10) * Density.FromKilogramsPerCubicMeter(2);
             Assert.Equal(SpecificWeight.FromNewtonsPerCubicMeter(20), specificWeight);
         }
+
+        [Fact]
+        public void AccelerationTimesDuration()
+        {
+            Speed speed = Acceleration.FromMetersPerSecondSquared(10) * Duration.FromSeconds(10);
+            Assert.Equal(Speed.FromMetersPerSecond(100), speed);
+        }
     }
 }

UnitsNet.Tests/CustomCode/DurationTests.cs

@@ -192,5 +192,12 @@ public void DurationMultipliedByElectricCurrentEqualsElectricCharge()
             ElectricCharge ah = Duration.FromHours(5) * ElectricCurrent.FromAmperes(4);
             Assert.Equal(20, ah.AmpereHours);
         }
+
+        [Fact]
+        public void DurationTimesAcceleration()
+        {
+            Speed speed = Duration.FromSeconds(10) * Acceleration.FromMetersPerSecondSquared(10);
+            Assert.Equal(Speed.FromMetersPerSecond(100), speed);
+        }
     }
 }

UnitsNet/CustomCode/Quantities/Acceleration.extra.cs

@@ -12,5 +12,13 @@ public partial struct Acceleration
         {
             return new SpecificWeight(acceleration.MetersPerSecondSquared * density.KilogramsPerCubicMeter, UnitsNet.Units.SpecificWeightUnit.NewtonPerCubicMeter);
         }
+
+        /// <summary>
+        /// Multiply <see cref="Acceleration"/> and <see cref="Duration"/> to get <see cref="Speed"/>.
+        /// </summary>
+        public static Speed operator *(Acceleration acceleration, Duration duration)
+        {
+            return new Speed(acceleration.MetersPerSecondSquared * duration.Seconds, UnitsNet.Units.SpeedUnit.MeterPerSecond);
+        }
     }
 }

UnitsNet/CustomCode/Quantities/Duration.extra.cs

@@ -103,5 +103,13 @@ public static explicit operator Duration(TimeSpan duration)
         {
             return ElectricCharge.FromAmpereHours(current.Amperes * time.Hours);
         }
+
+        /// <summary>
+        /// Multiply <see cref="Duration"/> and <see cref="Acceleration"/> to get <see cref="Speed"/>.
+        /// </summary>
+        public static Speed operator *(Duration duration, Acceleration acceleration)
+        {
+            return new Speed(acceleration.MetersPerSecondSquared * duration.Seconds, UnitsNet.Units.SpeedUnit.MeterPerSecond);
+        }
     }
 }