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

Answer:

28 N

Step-by-step 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

$\sf F_{net}=4 \times 7=28 \ N$

Answer 2

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 ;

${:\implies \quad \sf F=4\times 7}$

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

This is the required answer