Question

1) a car covers a distance of 50 km at a speed of 25 km/hr and next 50 km at a speed of .40 km/hr and return back the total distance at a speed of 20 km/hr. find its average speed

2) an athlete along the circular for track radius 77m and complete its 2 1/ 2 time revolution in 98 second find his average speed and velocity


3) two cars of mass 1000 kg and 2000 kg was running at a speed of 90 km per hour and 72 kilometre per hour in the same direction and collides with each other. find combined velocity

4) a Gun man fires a bullet from his gun the mass of bullet is 50 gram and the mass of the gun is 5kg if the speed of bullet was 400 meter per second find the recoil velocity of the gun ​

Answer 1

Answer:

(1) Average speed= 100 km/h

Explanation:

Let average speed be x

So, total distance = 50km+50km+100km* = 200km

then x = 25×40×20/200 = 100 km/h

* = 100 came when 50km + 50km

here 100km is returned distance at 20km/hr

I am here for your help