Question

A car travels with the speed of $15\text{m/s}$ for $0<t\le 10\text{sec}$, $20\text{m/s}$ for $10<t\le 20\text{sec}$ and $5\text{m/s}$ for $20<t\le 25\text{sec}$. The total distance travelled by the car is

• A. $175\text{m}$
• B. $375\text{m}$
• C. $275\text{m}$
• D. $300\text{m}$

Answer 1

The correct option is B $375\text{m}$

For constant speed distance travelled is given by $s=vt$
So, for each time interval the distance travelled by the car is
$s_1=15\times (10-0)=150\text{m}$
$s_2=20\times (20-10)=200\text{m}$
$s_3=5\times (25-20)=25\text{m}$
Hence, total distance travelled by the car is $150+200+25=375\text{m}$