The speed is 4.1 miles per hour.
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16 feet/second is the speed. To know the velocity, you would also need to specify the direction in which the object moves.
I assume the object starts from rest. The speed will be 16*3 which is 48m/s
"Per second per second" is a measurement of acceleration. If an object (such as a car) is moving, its speed can be measured in terms of miles per hour, or feet per second (which work out to be a similar figure to miles per hour). If the car is accelerating, the acceleration can be measured in terms of additional speed (feet per second) that is acquired in a given second, therefore, feet per second per second. Get it?
Neglecting the effect of air resistance, the speed of any falling object ... including ice cubes ... is always 32.2 feet per second greater than it was one second earlier.
20 feet per second. Divide the distance travelled by the time taken - so 180 / 9 = 20