Answer:
the car's average acceleration is 2.77 m/s^2.
Step-by-step explanation:
The average acceleration of the car can be calculated using the formula for average acceleration, which is:
a = (v_f - v_i) / t
where:
a is the average acceleration
v_f is the final velocity (70 km/h)
v_i is the initial velocity (0 km/h)
t is the time taken (7 seconds)
First, we need to convert the velocity from km/h to m/s, as the formula requires both velocities to be in the same units. 70 km/h is equivalent to 70 * 1000 / 3600 = 19.44 m/s.
Plugging the values into the formula:
a = (19.44 - 0) / 7
a = 2.77 m/s^2
So the car's average acceleration is 2.77 m/s^2.