Question

Calculate the force needed to move a 25 kg object for 4.2 seconds if it starts at rest and reaches a speed of 10 m/s.

Answer 1

59.5 newtons.

F = ma

First, let's calculate the acceleration using the kinematic equation:

v = u + at

Substitute the values:

10 = 0 + a x 4.2

a = 10 divided by 4.2

a = 2.38 m/s$x^{2}$

Now, substitute the mass and acceleration back into the force equation:

F = 25 x 2.38

F = 59.5 N