A parachute is driven toward east direction with a speed of 20ms-1. A ball is thrown out with the speed of 4ms-1. What wil be the speed of the ball after it has been thrown out of parachute.

24

Explanation:

Well I'm not sure, but if I understand it right, the answer should be 24ms-1, downwards.

Well in short,

Since you're going down at 20ms-1 holding the ball in your hand, that means the ball is also falling at 20ms-1 right? Make sense right? Ya

Cuz i thing in motion stays in motion unless a force is acted upon it

So let's say the person just let go of the ball, it will be 20m/s, but since the question said he threw it with a speed of 4m/s, that means the speed is

20 +4 = 24m/s