Question

A certain force acting on a mass of 15kg for 3s, gives it a velocity of2m/s. Find the magnitude of force

Answer 1

u=0
v = 2 m/s
t = 3s
as, v = u +at
⇒2 = 3a
⇒a = 2/3 m/s²

Force = mass×acceleration
          = 15×(2/3) = 10 N or 10 Kg m/s²

Answer 2

ANSWER:

10 N is the magnitude of force.

EXPLANATION:

In the given question the Initial velocity u is equal to zero and the final velocity V is equal to 2 meter per second. Time being 3 second. To first define acceleration we have to use Newton's Law of Motion V = U+at

Putting the values in the above equation we get,  

$2=0+a \times 3$

$\Rightarrow a=2 / 3$

Hence we get acceleration as $2 / 3$ meter per Second Square.  

Now to find force we have to apply the formula

F= ma {Where f is force, M is mass, and a is acceleration}

$F=15 x^{2 / 3}=10 N$