The instantaneous speed at 70 seconds is determined as 1.20 m/s.
How to calculate the instantaneous speed?
The instantaneous speed at 70 seconds is calculated by applying the following formula as shown below;
v = distance traveled / time of motion
The distance traveled by the object at 70 seconds is equal to 84 m.
The time of motion of the object is 70 s
The instantaneous speed at 70 seconds is calculated as;
v = 84 m / 70 s
v = 1.20 m/s
Thus, the instantaneous speed at 70 seconds is determined as 1.20 m/s.