Doug used a magnet to move a .025kg ball. The magnet exerts a force of 5N, which causes the ball to begin moving. What is the acceleration of the ball when it begins to move?

Explanation:

Given that,

The mass of a ball, m = 0.025kg

The force exerted by the magnet, F = 5 N

We need to find the acceleration of the ball when it begins to move. Let a be the acceleration. The net force of the ball is given by :

F = ma

Where

a is acceleration of the ball

so, the required acceleration of the ball is .

answer is d because it is trust me

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j