Question

1. sarah and her fiends on the swim team are playing on the high dive. one of sarahs friends throws a backpack with swim supplies in it into the pool from the high dive. the backpack weighs 50n. when the backpack hit the water, it encounters a 50 n upward force. the swim coach also is the physics teacher says this is a great opportunity to discuss the forces exerted on the backpack. which statement is correct

once the backpack hits the water, the forces are equal and will stop moving.
once the backpack hits the water, the forces are equal but the back pack will continue to move
once the backpack hits the water, the forces are balanced and the back pack will stop moving
the upward force of the water on the backpack is less than the downward pull of gravity. the backpack will acclerate to the to the bottom of the pool.
other:

Explanation:

According to Newton's first law of motion, an object in motion will stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. When the backpack hits the water, the upward force (50 N) is equal to the downward force (weight = 50 N), so the net force is \(F_{net}=F_{up}-F_{down}=50 - 50=0\) N. But before hitting the water, the backpack was in motion (falling), and since there is no unbalanced force to stop it (forces are balanced, \(F_{net} = 0\)), it will continue to move due to its inertia.

Answer:

Once the backpack hits the water, the forces are equal but the back pack will continue to move