Question

A ball with a mass of 5 kg is acted upon by a force of 20 N. If the ball begins

moving from a velocity of 0 m/s and accelerates for 2 seconds, what is its change
in velocity?


A) 0 m/s
B) 2 m/s
C) 4 m/s
D) 8 m/s

Answer 1

The ball's change in velocity is 8 m/s.

Step-by-step explanation:

The change in velocity of an object can be found using the equation:

Δv = a * t

Where Δv represents the change in velocity, a represents the acceleration, and t represents the time. In this case, the ball's initial velocity is 0 m/s, acceleration is calculated using Newton's second law of motion:

F = m * a

where F represents the force and m represents the mass.

Using the given values, the acceleration can be calculated as:

a = F / m = 20 N / 5 kg = 4 m/s²

Plugging the values into the equation for change in velocity:

Δv = 4 m/s² * 2 s = 8 m/s

Therefore, the ball's change in velocity is 8 m/s (D).