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You and a friend stand on a snow-covered roof. You both throw snowballs with the same initial speed, but in different directions. You throw your snowball downward, at 40° below the horizontal; your friend throws her snowball upward, at 40° above the horizontal. When the snowballs land on the ground, is the speed of your snowball (a) greater than, (b) less than, or (c) the same as the speed of your friend’s snowball?

R E A S O N I N G   A N D    D I S C U S S I O N

One consequence of symmetry in projectile motion is that when your friend’s snowball returns to the level of the throw, its speed will be the same as the initial speed. In addition, it will be moving downward, at 40° below the horizontal. From that point on its motion is the same as that of your snowball; thus it lands with the same speed.

What if you throw your snowball horizontally? Or suppose you throw it straight down?
In either case, the final speed is unchanged! In fact, for a given initial speed, the speed on landing simply doesn’t depend on the direction in which you throw the ball. 

A N S W E R

(c) The snowballs have the same speed 

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Solid State Physics 1 Complete handwritten notes   

(rk puri vk babber & M A Wahab book)

Solid State Physics 2 Complete handwritten notes  

(rk puri vk babber & M A Wahab book)

Solid State Physics  chap # 1 problems solution

(rk puri vk babber solid state physics book)

BOOKS

Basic Electronics  book by Pakistani author

Nuclear physics-1 book by Pakistani author

Nuclear physics complete book  by Pakistani author

Solid State Physics by M A Wahab 3rd ed,

Mechanics part 2 by indian author

Electricity and magnetism book by indian author

Methods of Mathematical Physics by Syed Jamal Anwar 

Solid state physics by RK Puri VK Babber book pdf

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