An object is dropped from rest and falls freely. after 6 seconds, calculate its instantaneous speed, average speed, and distance fallen.

1. The instantaneous speed is the speed of an object at a particular point in time. Instantaneous speed changes all the time. 
From the question given above:
T [time] = 6 seconds
To calculate instantaneous speed, the initial speed will be taken to be zero because the object was dropped from rest. The gravitation pull = 9.8 m/s [approximately 10m/s].
For instantaneous speed, V= gt, where V is the instantaneous speed, g is the gravitational pull and t is the time
V = gt = 10 * 6 = 60
Therefore, V = 60 m/s.

2. Average speed is defined as the change in distance divided by the change in time.
To calculate average speed W = [final speed + initial speed]/2
Final speed = 60 m/s
Initial speed = 0 m/s
W =[60 + 0]/2 = 30
Therefore, average speed = 30 m/s.

3. To calculate distance fallen, the formula of speed will be used
Average Speed = distance/ time
Distance =  average speed * time = 30 * 6 = 180
Therefore, the distance fallen = 180m.

It should be d if not then c

Milliseconds. . . . . .