Newton meter
Torque wrench
Or Just a plain Scale
Answer:
Time taken to accelerate to 48 m/s = 8 seconds
Explanation:
Initially the object is moving south at = 
So, initial velocity of the object = 
Acceleration caused by the force = 4 
Final velocity towards south = 
Using equation of motions:

where
final velocity
initial velocity
acceleration
time
Plugging in values.


Subtracting both sides by 16


Dividing both side by 4.


∴ 
Time taken to accelerate to 48 m/s = 8 seconds
Answer: Newton's law of universal gravitation is usually stated that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers