5)As the traffic light becomes green, a car starts to travels with an acceleration of 2.5 m/s2. Calculate the velocity of this car in km/h after 12 seconds of acceleratio
v=a*t
change the veloicty from m/s to km/hr
6.94Km/hr
To calculate the velocity of the car after 12 seconds of acceleration, we can use the following steps:
Step 1: Determine the initial velocity. In this case, the car starts from rest, so the initial velocity is 0 m/s.
Step 2: Use the formula for velocity with constant acceleration:
Final velocity (v) = initial velocity (u) + (acceleration (a) × time (t))
Step 3: Substitute the given values into the formula. In this case:
u = 0 m/s (initial velocity)
a = 2.5 m/s² (acceleration)
t = 12 s (time)
v = 0 + (2.5 × 12)
v = 30 m/s
Step 4: Convert the velocity from meters per second to kilometers per hour. We can do this by multiplying the value by 3.6 since there are 3.6 kilometers in a meter and 3600 seconds in an hour:
v = 30 × 3.6
v ≈ 108 km/h
Therefore, the velocity of the car after 12 seconds of acceleration will be approximately 108 km/h.