[3 Mark Question Answer]

Question 13 Marks

A bus moves with an average speed of 60 km/hr for 4.5 hr. Find the distance travelled by it?

Answer

Speed, $v=60 km / hr$
Time $( t )=4.5 hr$
Distance $( s )=$ ?
Speed $=\frac{\text { distance }}{\text { time }}$
Distance $=$ speed $x$ time $=60 \times 4.5=270 km$

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Question 23 Marks

A train covers a distance of $820 \ km$ with a speed of $80 \ km/hr.$ How long does it take to finish the journey ?

Answer

Distance covered $( s )=820 \ km$
Speed $( v )=80 \ km / hr$
Time $(t)= ?$
We know,
$\text { Speed }=\frac{\text { distance }}{\text { time }}$
$\text { Time }=\frac{\text { distance }}{\text { speed }}$
$\frac{820}{80}$
$=10.25$ hours

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Question 33 Marks

What do you understand by: a. average speed, b. non-uniform velocity of a body?

Answer

a. The ratio of the total distance travelled to the total time of travel is called the average speed. It is calculated by ‘ using the formula Total distance travelled
$S _{a v}=\frac{\text { Total distance travelled }}{\text { Total time taken }}$
b. If an object covers unequal distances in equal intervals of time in a given direction, it is said to have a non-uniform velocity. If a car moves 70 km in the first hour of its journey and 50 km in the second hour, it is said to have a non-uniform velocity.

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PHYSICS [3 Mark Question Answer]

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