Question

A person throws a ball.straight up with a speed of 12 m/s. If the bus is
moving at 25 m/s, what is the velocity of the ball to an observer on
ground?
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Answer 1

Answer:

25m/s

Explanation:

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Answer 2

Answer:

Explanation:

See here we use the concept of relative motion.

Generally things we watch while in motion are different if we observe them from rest.

Here velocity of ball is given with respect to observer in bus = 12 m/s in y direction

Velocity of moving bus is 25 m/s in x direction

Therefore by relative motion

Velocity of ball w.r.t ground = 12j+25i (Vectorial Form)

Now to calculate the magnitude of velocity = √12²+25²=√144+625=√769 = 27 m/s