Two waves on identical strings have the same frequency. Wave one has a frequency four times larger than Wave Two. If their wave speeds are the same, then how do their wavelengths compare?

prolly a beacuse the momentuem the car has increases while going down hill

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.

i think the answer is a, hope this : )