Question 1 Select the correct choices to complete the sentence.
Identify each of the following as either a contact force, field force, or not a force:

mass
ineria
the push of a hand
friction
air resistance
spring force gravity acceleration

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

trig 15.3 cos

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west