Question

A force $150N$ acts on a body mass $10kg$ for $5s$. The change in velocity in

• A. $500m/s$
• B. $20m/s$
• C. $10m/s$
• D. $75m/s$

Answer 1

Answer: (D)

$75m/s$

Acc. to Newton's law of motion

$F=ma$ ........(1)

here , $m=$ mass of body

$a=$ acceleration

given. $F=150N$

$m=10kg$

$t=5s$

so putting these values .... we can find out the acceleration from eq (1)

$150=10a$

$a=150÷10=15$

To find velocity we use formula of acceleration

$a=velocity÷time$

now put the values of a and t abd get velocity

$15=v÷5$

$v=15\times 5=75m/s$

Hence,

option $D$ is correct answer.