The amount of work (W) done on an object is equal to the force (F) needed to lift the object (the object’s weight) multiplied by the distance (d) the object is lifted: W = F ✕ d.
Use the weight of the ball that you calculated in activity B to determine how much work
would be required to lift the ball 2 meters above the zero position:

Work done during lifting up body is 0

Explanation:

From the question it is given that

Distance traveled by body during lifting is 2 m

since work done by body is given by

work done W = F x s x cosθ

Where F= mg = weight of body

s= distance traveled = 2m

θ = angle between force and distance vector

here θ = 90° as body is lifting up

on substituting the respected values we get

⇒ W = mg x 2 x cos90° = 0   {∵ cos90°= 0 }

Thus, work done during lifting up body is 0

sonar - device which is used to find the submit submarines, sankalp ship. sonar waves consists of a transmitter and detector which are installed in the observation centre on board of a ship. the ultrasonic waves are sent into the sea at high frequency about 1000 khz in all direction.

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