# Momentum problem help

#### rachael

11 A racing car of mass 2500 kg changes its velocity from
220 km h–1 due south to 200 km h–1 due north in 5.0 s
on a racing track.

c What is the average force applied?
d What is the impulse of this force?
e What is the change in the momentum of the car?

what does part c means?
how do we find the average force applied?

thank you

#### nrqed

Homework Helper
Gold Member
rachael said:
11 A racing car of mass 2500 kg changes its velocity from
220 km h–1 due south to 200 km h–1 due north in 5.0 s
on a racing track.

c What is the average force applied?
d What is the impulse of this force?
e What is the change in the momentum of the car?

what does part c means?
how do we find the average force applied?

thank you
The average force applied is $F_{average} = {\Delta p \over \Delta t}$, that is, the change of momentum over the time interval over which the change of momentum took place (this is the average form of $F_x = { dp_x \over dt}$ for example).

Patrick

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