Solving numerical on Average speed.

The ratio of the average speed of oxygen molecules to the average speed of hydrogen molecule at same temperature is

Can a body have a. Zero instantaneous velocity and yet be accelerating? b. Zero average speed but non-zero average velocity? c. Negative acceleration and yet be speeding up? d. Magnitude of average velocity be equal to average speed ?

Assertion In circular motion, average speed and average velocity are never equal. Reason In any curvilinear path, these two are never equal.

Assertion : Magnitude of average velocity is equal to average speed, if velocity is constant. Reson : If velocity is constant, then there is no change in the direction of motion.

Assertion : On a curved path, average speed of a particle can never be equal to average velocity. Reason : Average speed is total distance travelled divided by total time. Whereas average velocity is, final velocity plus initial velocity divided by two.

Fig. show the x-t plot of a particle in one dimensional motion. Three different equal intervals of time are shown. In which interval the average speed is greatest and in which it is the least? Give the sign of average speed for each interval. .

An automobile driver travels from a plain to a hill station 120 km away at an average speed of 30 km per hour. He then makes the return trip at an average speed 25 km per hour. He covers another 120 km on the plain at an average speed of 50 km per hour. His average speed (in km/hr) over the entire distance of 360 km will be

Under what condition is the magnitude of the average velocity of a particle moving in onbe dimension smaller than the average speed over same time interval?

Statement-1: Magnitude of average velocity is equal to average speed, if velocity is constant. Statement-2: It is possible when the direction of motion keeps changing.

Assertion: The average velocity of a particle is zero in a time interval. It is possible that the instantaneous acceleration is never zero in the interval. Reason: The magnitude of average velocity in an interval is equal to its average speed in that interval.