Question

A force of 10 N starts acting on a body of mass 5 kg at rest. Its velocity after 5 sec will be:

a) 10 m/s
b) 8 m/s
c) 5 m/s
d) 2 m/s

Answer 1

GiveN :

• Force = 10N
• Mass = 5kg
• Initial velocity = 0 m/s
• Time = 5s

To FinD :

• Final velocity

SolutioN :

$\\\\ \sf{\longrightarrow\ F\ =\ ma}$

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

$\sf{\longrightarrow\ 10\ =\ \cancel{5}\ \times\ \dfrac{(v\ -\ 0)}{\cancel{5}}}$

$\sf{\longrightarrow\ 10\ =\ v\ -\ 0}$

$\sf{\longrightarrow\ v\ =\ 10\ ms^{-1}}$