Question

A force of 100 N acting on a certain mass for 4 second gives it a velocity of 20 m/s . Find the mass of the body if the body was initially at rest. ​

Answer 1

velocity = 20 m/s

time = 4 seconds

acceleration = 20/4 = 5 m/s^2

force = 100 N

we know,

Force = mass × acceleration

or, mass = force / acceleration

or, mass = 100 /5

or, mass =20

Hence, mass of the body is 20 kg

Answer 2

$\huge\mathbb\purple{Here \:is \:the \:Answer}$

m=?

F= 100 N

v = 20 m/s

t = 4 sec

u = 0

acceleration =

$\frac{v - u}{t}$

$\frac{20 - 0}{4}$

$\frac{20}{4}$

$= 5 m/s^2$

F = ma

$100 N = m*5$

$\frac{100}{5}$

= m

$\huge\boxed{m = 20}$

mass = 20 kg

$\huge\mathbb\purple{Hope \:it \:helps}$