A car moving at 4.5 m/s accelerates at 2.5 m/s square. How fast will it be moving after 7.5 seconds ?
v = 4.5+2.5(7.5) = 23.25 m/s
To find the speed of the car after 7.5 seconds, we can use the equation of motion:
final velocity = initial velocity + (acceleration * time)
Given:
Initial velocity (u) = 4.5 m/s
Acceleration (a) = 2.5 m/s^2
Time (t) = 7.5 seconds
Substituting these values into the equation, we have:
final velocity = 4.5 m/s + (2.5 m/s^2 * 7.5 s)
final velocity = 4.5 m/s + 18.75 m/s
final velocity = 23.25 m/s
Therefore, the car will be moving at a speed of 23.25 m/s after 7.5 seconds.