Question

A train in moving with a speed of 72 km/h. A
person on the earth finds that a monkey is
running on the roof with 90 km/h. Then
velocity of monkey w.rit. an observer sitting
inside the train is:
18 m/s
A
5 m/s
20 m/s
c.
25 m/s​

Answer 1

Answer:

c is the correct answer and please mark me as brainlist

Answer 2

Answer:

The speed of the monkey w.r.t train is 2.5 m/s or 22.5 m/s depending on the relative direction of motion.

Explanation:

Let speed of train be v = 72 km/hr

and velocity of monkey w,r,t to ground (u) = 90 km/hr

To convert km/hr to m/s we multiply it from $\frac{5}{36}$.

∴    v = 10 m/s

and u=12.5 m/s.

Let, velocity of monkey w.r.t observer sitting in the train be x.

x = u+v .

x = 22.5 m/s if the train and monkey are running in opposite direction.

The relative speed will be more.

OR

x = u-v .

x = 2.5 m/s if the train and monkey are running in the same direction.

The relative speed will be less.

#SPJ3

21 MAY 2022.