Magnitude, Direction of Momentum, & Velocity

[itsmarasilly]

Homework Statement

A compact car, mass 775 kg, is moving at 1.00 multiplied by 10^2 km/h toward the east.

(a) Find the magnitude and direction of its momentum.
(b) A second car, mass 2125 kg, has the same momentum. What is its velocity? (in km/h)

Homework Equations

The Attempt at a Solution

(a) 775 x 100 = 77,500 N s, to the east.. How do i convert this to kg m/s?

(b) 77,500 = mass x velocity
77,500 = 2125 x V
velocity = 77,500 / 2125
= 164,687,500 or 1.65 x 10^8 km/h

 

[rock.freak667]

For the units you multiplied you'd get kg km/h

to convert this to kgms^-1

you'd need to conert k (kilo) to 1000 and h (1 hour) to 360 seconds

thus you'd need to multiply by 1000/360