In aviation. it is helpful for pilots to know the cloud ceiling, which is the distance between the ground and lowest cloud. The simplest way to measure this is by using a spotlight to shine a beam of light up at the clouds and measuring the angle between the ground and where the beam hits the clouds. If the spotlight on the ground is 0.?5 lnnfrom the hangar door as shown in the image below, what is the cloud ceiling? m 0.75 km \fA person is rowing across the river with a velocity of 4.5 km/hr northward. The river is flowing eastward at 3.5 km/hr as shown in the image below. What is the magnitude of her velocity (v) with respect to the shore? Vriver Vrow N W E