Acar has 400 kgm/s worth of momentum and runs into a truck initially at rest. what is the initial momentum of the truck?

0 kgm/s

Explanation:

The momentum is the product of mass(m) and velocity(v).

Initially the velocity of truck is 0 m/s so the product of mass and velocity becomes 0.

It does not matter what is the weight of truck, because the velocity will make the product of m*v = 0

It does not matter what is the momentum of car.

distance

Explanation:

it is the measurement of how far light travels in a year

(one light year equals six trillion miles)