Science help???

Question

1. While an object is moving at a constant 20 m/s, a 5 N force pushes the object to the left. At the same time, a 5 N force is pushing the object to the right. What will the object's velocity be after 10 seconds?
2. A bowling ball has a mass of 6 kilograms. A tennis ball has a mass of 0.06 kg. How much inertia does the bowling ball have compared to the tennis ball?
3. A rider and motorcycle with a combined mass of 250 kg are driving down the road at a constant speed of 55 mph. The motorcycle’s engine is producing a force of 1,700 newtons
between the tires and the road.
a. Find the weight of the motorcycle and rider in newtons.
b. Find the normal force of the road on the motorcycle and rider.
c. Find the frictional force of the road and air on the motorcycle and rider.
4. What is the net force on the refrigerator shown to the right?
5. Jane has a mass of 40 kg. She pushes on a 50-kg rock with a force of 100 N. What force does the rock exert on Jane?

THANKS!!!!!!

Answer 1

I'll try.

1) The velocity is still 20 m/s. The question says that it is moving at a constant velocity and in addition, it INDIRECTLY said that the forces are balanced.

2) 6 kg - 0.06 kg = 5.94 kg

Since the bowling ball has more mass, n aturally it has more inertia since inertia is a quantity that is solely dependent upon the mass.

3)
_________________________
a]
W = mg
W = (250kg)(9.8m/s^2)
W = 2450 N is the weight
_________________________
b]
Since the forces are balanced because of the phrase "CONSTANT SPEED", the normal force is equal to the weight but oposite in direction.

It's 2450 N normal force!
__________________________
c]
The is NO frcition force since again, it is moving at a constant speed!
__________________________

4) I don't understand!

5) Also 100 N. This is can be explained bt the 3rd Law of Motion, Law of Interaction where "for every action, there's always an equal and opposite reaction"

Good luck and God bless!

Answer 2

1. The sum of forces is zero therefore it moves with a speed it was moving before the forces were applied.
2. Yes the difference in inertia is proportional to the difference in masses.
(Thumbs up to Dj for the two problems above)
3.
a) 250 kg of combined weight. What a small motorcycle.
The weigh is the product of mass times acceleration due to gravity.
W=mg= 2450 N
b) Since I presume the motorcycle is moving on the leveled surface the normal force in this case equal to W. Normal force is the force perpendicular to the surface.
c) Since the tires don't spin action is equal to the reaction
f= 1,700N. If there was no friction the tires would spin and motorcycle would remain in the same place regardless of amount force supplied by the engine.

4. I see nothing on the right...

5. Action of Jane equal to reaction the rock.
Action = 100N
Reaction = 100N

Answer 3

in answer 3c the friction force is equal to the engine force (1700N) because at constant speed they cancel out - no force = no acceleration