1. A 1700-kg car traveling east at 18 m/s collides with a moving 2500-kg truck.
After they collide, the two interlock and move together with a velocity of 30 m/s
west. What was the original velocity of the truck?

The speed of the truck is 62.64 m/s towards west

Explanation:

As we know that there is no external force on the system of car and truck

so we can say that total momentum of the system must be conserved

so we will have

here we know that

now we have

Towards West

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.