Question

An object with a mass of 4 kg accelerates 7 m/s2 when an unknown force is applied to it. What is the amount of the force?

Answer 1

According to Newton's second law of motion, we knows that a body whose mass is m kg, moves with an acceleration a m/s² produces a force F, which is given by ;

• 
  `{\boxed{\bf{F=ma}}}`

So, here force on the body will be ;

`{:\implies \quad \sf F=4* 7}`

`{:\implies \quad \bf \therefore \quad \underline{\underline{Force=28\:\:Newton}}}`

This is the required answer

Answer 2

28 N

Explanation:

Newton's Second Law (equation of motion):
`\sf F_(net)=ma`

• 
  `\sf F_(net)` = resultant force
• a = acceleration
• m = mass

Given:

• 
  `\sf a = 7 \ ms^(-2)`
• m = 4 kg

`\sf F_(net)=4 * 7=28 \ N`