A0.700-kg particle has a speed of 1.90 m/s at point circled a and kinetic energy of 7.20 j at point circled b. (a) what is its kinetic energy at circled a? 1.2635 correct: your answer is correct. j (b) what is its speed at circled b? 4.54 correct: your answer is correct. m/s (c) what is the net work done on the particle by external forces as it moves from circled a to circled b?

a).

b).

c). Δ

Explanation:

ΔE=kinetic energy

a).

b).

c).

net work= EkA+EkB

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day