Hi!
The answer is 8 m/s^2
Step-by-step explanation:
Acceleration is defined as the rate of change of an object's velocity, per unit time. Meaning, the rate at which an object is increasing/decreasing its velocity with the passage of time in a given period.
If an object is moving at constant velocity, its acceleration would be 0, because there is no change in velocity. In our case, the velocity is increasing, and to calculate this, we will use a simple formula,
acceleration = change in velocity / time
and change in velocity is calculated by subtracting the value of initial velocity (u) from final velocity (v).
Our known values are:
u = 7m/s
v = 15m/s
t= 1s
a = ?
Putting the values in the equation for acceleration:
a = u - v / t
a = 15 - 7 / 1
a = 8 m/s^2
Hope this helps!