High School

A car has a mass of 1550kgs and a velocity of 25m/s. What is its momentum with correct units?


Select one:


a.


p=38750 kg*m/s


b.


p=62 kg/m/s^2


c.


p=62 kg/m/s


d.


p=38750 kg*m/s^2


A car has a mass of 1550kgs and a velocity of 25m/s. If it stops in 4 seconds, what average force was applied to stop the car?


a.


f=38750 N


b.


f=9687.5 N


c.


f=62 N


d.


f=38750 N*m

Answer :

1. The momentum of the car with the correct units is:

a. p = 38750 kg·m/s. 2. The average force applied to stop the car is: b. f = 9687.5 N

we can calculate them as follows

1. The momentum (p) of an object is calculated by multiplying its mass (m) by its velocity (v).

Given that the mass of the car is 1550 kg and its velocity is 25 m/s, we can calculate the momentum as:

p = m * v = 1550 kg * 25 m/s = 38750 kg·m/s

Therefore, the momentum of the car with the correct units is 38750 kg·m/s.

2. The average force (f) applied to stop the car can be calculated using the equation:

f = Δp / Δt

Given that the car stops in 4 seconds and the initial momentum (p_i) is 38750 kg·m/s, the change in momentum (Δp) is equal to the initial momentum (p_i) since the car comes to a complete stop. Therefore, Δp = p_i = 38750 kg·m/s.

Substituting these values into the formula, we get:

f = Δp / Δt = 38750 kg·m/s / 4 s = 9687.5 N

Therefore, the average force applied to stop the car is 9687.5 N.

learn more about force here:

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