calculate the impulse necessary to stop a 1500 kg car travelling at 90km/hour
Impulse=mass*changeinVelocity
I recommend change km/hr to m/s
To calculate the impulse necessary to stop a car, you need to determine its initial velocity, final velocity, and mass. In this case:
Mass of the car (m): 1500 kg
Initial velocity (u): 90 km/h
To obtain the necessary information, we first need to convert the initial velocity from kilometers per hour to meters per second.
1 km/h = 1000 m / 3600 s
So, initial velocity (u) = 90 km/h * (1000 m / 3600 s) = 25 m/s
The final velocity (v) of a car when it stops is 0 m/s.
Now, we can calculate the impulse (J) using the formula:
J = m * (v - u)
Substituting the values, we get:
J = 1500 kg * (0 m/s - 25 m/s)
J = 1500 kg * (-25 m/s)
J = -37,500 kg·m/s
Therefore, the impulse necessary to stop the 1500 kg car traveling at 90 km/h is -37,500 kg·m/s. The negative sign indicates that the impulse is acting in the opposite direction of the car's initial motion, as it needs to decelerate to a stop.