If a person stands near a fast moving train, there is a possibility of his falling-- explain.

Explain this common obdervation clearly . If you look out of the window of a fast moving train the neaeby trees house etc seem to move rapidly in a direstion opposite to the train motion rapidly in a direction opposite to the train s motion, but the distant objects (hill tops, the Moon, the stars etc.) seem to be stationar since you are aware that- you* are movingthese distant objects seem to move with you)

A courier-person cycles from a town to a neighbouring suburban area to deliver a parcel to a merchant. His distance from the town at different times is shown by the following graph. Did the person stop on his way? Explain.

A boy standing on a stationary lift (open from above) throws a ball upwards with the maximum initial speed he can, equal to 49 m/s. How much time does the bail take to return to his hands? If the lift starts moving up with a uniform speed of 5 m/s and the boy again throws the ball up with the maximum speed he can, how long does the ball take to return to his hands?

A far sighted person has his near point 50 cm. Find the power of lens he should use to see at 25 cm clearly.

A 70 kg man stands in contact against the inner wail of a hollow cylindrical drum of radius 3 m rotating about its vertical axis with 200 rev/min. The coefficient of friction between the wall and his clothing is 0.15. What is the minimum rotational speed of the cylinder to enable the man to ' remain stuck to the wall (without falling) when the floor is suddenly removed?

A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting near vision?

A person needs a lens of power -5.5 dioptres for correcting his distant vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting distant vision?

The driver of a three-wheeler moving with a speed of 36 km/ h sees a child standing in the middle of the road and brings his vehicle to rest in 4.0 s just in time to save the child. What is the average retarding force on the vehicle? The mass of the three-wheeler is 400 kg and the mass of the driver is 65 kg.