A 1500kg car slows from 45km/h[E] to 30km/h[E]

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In summary, the mass of a car has a direct impact on its speed as a heavier car requires more force to change its speed compared to a lighter car. The acceleration of the car can be calculated using a formula, but it cannot be determined without the time taken to slow down. The direction of the car affects its acceleration, and the force acting on the car to slow it down is the friction force between the tires and the road. The distance traveled while slowing down cannot be determined without the time taken.
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marshall4
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a 1500kg car slows from 45km/h[E] to 30km/h[E]. What is the impulse from the brakes?
 
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This should probably be posted in the homework help section.

Nautica
 
  • #3
45km/h = 12.5m/s
30km/h = 8.3333m/s

I = mdv
I = (1500) x (8.333 - 12.5)
I = -6250kgm/s
 

1. How does the mass of the car affect its speed?

The mass of the car has a direct impact on its speed. In this scenario, the car has a mass of 1500kg, which means it has a larger inertia and requires more force to change its speed compared to a lighter car.

2. What is the acceleration of the car?

The acceleration of the car can be calculated using the formula a = (v2 - v1)/t, where a is the acceleration, v2 is the final velocity (30km/h) and v1 is the initial velocity (45km/h). The time taken for the car to slow down is not provided in the given information, so the acceleration cannot be determined.

3. Does the direction of the car affect its acceleration?

Yes, the direction of the car does affect its acceleration. In this scenario, the car is slowing down in the east direction, which means the acceleration is also in the east direction. If the car was slowing down in a different direction, the acceleration would also change accordingly.

4. What is the force acting on the car to slow it down?

The force acting on the car to slow it down is the friction force between the car's tires and the road. When the brakes are applied, the friction force increases, causing the car to slow down.

5. How far does the car travel while slowing down from 45km/h to 30km/h?

The distance traveled by the car while slowing down can be calculated using the formula d = (v1 + v2)t/2, where d is the distance, v1 is the initial velocity (45km/h), v2 is the final velocity (30km/h), and t is the time taken to slow down. Since the time is not provided, the distance cannot be determined.

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