Starting from rest, a 4.0-kg body reaches a speed of 8.0 m/s in 2.0 s.

What is the net force acting on the body?

The acceleration is

a = 8.0/2.0 = 4.0 m/s^2

The net force acting upon it is
F = m a = 4 * 4 = 16 newtons

Make sure you learn Newton's Law,
F = m a.

F if the net force and m is the mass.

To find the net force acting on the body, we can use Newton's second law of motion, which states that the net force acting on an object is equal to the product of its mass and acceleration.

Given:
Mass of the body, m = 4.0 kg
Initial velocity, u = 0 m/s
Final velocity, v = 8.0 m/s
Time, t = 2.0 s

First, let's find the acceleration of the body using the equation:

acceleration (a) = (final velocity - initial velocity) / time

a = (v - u) / t

a = (8.0 m/s - 0 m/s) / 2.0 s

a = 8.0 m/s / 2.0 s

a = 4.0 m/s^2

Now, we can calculate the net force using the equation:

net force (F) = mass * acceleration

F = m * a

F = 4.0 kg * 4.0 m/s^2

F = 16 N

Therefore, the net force acting on the body is 16 Newtons.

To calculate the net force acting on the body, you can use Newton's second law of motion, which states that the net force (F_net) acting on an object is equal to the mass (m) of the object multiplied by its acceleration (a):

F_net = m * a

In this case, the mass (m) of the body is given as 4.0 kg, and the time it takes to accelerate from rest to a speed of 8.0 m/s is given as 2.0 s.

To find the acceleration (a), you can use the formula for average acceleration, which is the change in velocity (v) divided by the time (t):

a = (v - u) / t

Where:
v = final velocity = 8.0 m/s
u = initial velocity = 0 m/s (since the body starts from rest)
t = time taken = 2.0 s

Substituting the values into the formula, we get:

a = (8.0 m/s - 0 m/s) / 2.0 s
a = 8.0 m/s / 2.0 s
a = 4.0 m/s²

Now, substitute the values of mass (m = 4.0 kg) and acceleration (a = 4.0 m/s²) into the formula for net force:

F_net = m * a
F_net = 4.0 kg * 4.0 m/s²
F_net = 16.0 N

Therefore, the net force acting on the body is 16.0 Newtons.