Two identical objects, A and B, of mass M =
1 move along a horizontal air track. Object
B initially moves to the right with speed v =
1. Object A initially moves to the right
with speed y = 3, so that it collides with
object B. There is no friction.
a. Determine the total momentum of the
two objects (add their momentums
together

Explanation:

p=mv

total momentum=m1v1+m2v2

=(1)(3)+(1)(1)

=4kgms^-1

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y