Question

A force of 45N acts on a stationary body for 4 seconds and the body acquired a velocity of 36m/s.calculated the mass of the body​

Answer 1

Answer:-

• Initial velocity=u=0m/s
• Final velocity=v=36m/s
• Time=t=4s
• Force=45N=F
• Mass=m=?

acceleration be a

We know

$\boxed{\sf Acceleration=\dfrac{v-u}{t}}$

According to Newton's second law

$\boxed{\sf F=ma}$

• Putting Acceleration formula

$\\ \sf \longmapsto F=\dfrac{m(v-u)}{t}$

$\\ \sf \longmapsto 45=\dfrac{m(36-0)}{4}$

$\\ \sf \longmapsto 45=\dfrac{36m}{4}$

$\\ \sf \longmapsto 45=9m$

$\\ \sf \longmapsto m=\dfrac{45}{9}$

$\\ \sf \longmapsto m=5kg$