Question

A super car moving at a speed of 200 km/h ejects its exhaust particles at a speed of 800 km/h relative to the car. Find the speed of the exhaust with respect to an observer standing on the road side?

Answer 1

Given that,

Speed of the car$V_c=200km/h$

Relative speed of the exhaust with respect to the car $V_E=-800km/h$

Let the relative speed of the exhaust with respect to the observer $=V_{OE}=VOE$

So,

$V_C=V_{OE}-V_E$

$V_{OE}=V_C+V_E$

$V_{OE}=200-800$

$V_{OE}=-600km/h$

The negative sign indicates that the exhaust is moving in a direction opposite to the car.