Question

7. An object with a weight of 19.6 N moves with a constant velocity of 20.0 m/s. A net

force of 6.00 N is applied to the object in the direction of its motion for 4.00 seconds.
What is the final momentum of the object?

Answer 1

118.4kgm/s

Step-by-step explanation:

Given parameters:

Weight of object = 19.6N

mass of object = 19.6/9.8 = 2kg

Constant velocity = 20m/s

Force applied = 6N

Time taken = 4s

Unknown:

Final momentum of the object = ?

Solution:

To solve this problem, we use Newton's second law of motion;

Ft = m (v - u)

F is the force applied

t is the time taken

m is the mass

v is the initial velocity

u is the time taken

Ft = mv - mu

mv is the final momentum;

So;

Final momentum = Ft + mu

Final momentum = (19.6 x 4) + (2 x 20) = 118.4kgm/s