Question

What force will be required to speed up a car having mass of $1200kg$, from $5m/s$ to $15m/s$ in $10$ second?

• A. $300N$
• B. $1200N$
• C. $3N$
• D. $0$

Answer 1

Answer: (B)

$1200N$

Given : $m=1200$ kg $u=5$ m/s $v=15$ m/s

$t=10$ s

Using $v=u+at$

$\therefore$ $15=5+a\left(10\right)$ $⟹a=1$ $m/s^2$

Thus force required $F=ma=1200\times 1=1200$ $N$