Answer:
1.97J
Explanation:
Given parameters:
Mass of the groceries = 7kg
velocity of the bag = 75cm/s
Unknown:
Work done to move the bag = ?
Solution:
Work done is the force applied to move a body through a distance in a specific direction:
Work done = Force x distance
In this case, the work done is the kinetic energy applied in pulling the bag.
Kinetic energy is the energy in motion of a body.
Work done = kinetic energy =
where m is the mass
v is the velocity
Now, convert the velocity from cm/s to m/s
100cm = 1m
75 x
= 0.75m/s
Work done = x 7 x 0.75² = 1.97J