investigators are on the scene of a terrible traffic accident involving a large truck and a passenger van. the van had been stopped at a red light, but the large truck's brakes had failed so it plowed into the stationary van. how would they calculate the amount of momentum with which the truck hit the van?

by multiplying the van's speed by the truck's speed
by multiplying the van's mass by the truck's mass
by multiplying the van's mass by its acceleration
by multiplying the truck's mass by its velocity

By multiplying the truck's mass by its velocity

Explanation:

Momentum p=mv where m is the mass of object and v is the velocity of the object.

From the formula, it's clear that momentum is a product of mass and velocity. Therefore, to find the momentum with which the truck hit the van, we multiply  the truck's mass by its velocity

depends on what you mean by "group." for order, it would be coleoptera (beetles). for class, it would be insecta (insects). for phylum, it would be the arthropoda (animals with jointed exoskeletons).

explanation:

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."