Question

A ball thrown vertically upward reaches a height of 80 m . Calculate the speed of the ball upon arrival on the ground.
Also Calculate the time to reach the highest point.

Answer 1

@RaphaelFilgueiras

Answer 2

@sauravshakya @ganeshie8 @Callisto @cinar

Answer 3

@.Sam. @hba

Answer 4

@Rohangrr @myininaya @amistre64 @Algebraic! @akash809

Answer 5

somebody.... solve it

Answer 6

Use:
v^2=u^2 +2as
where u=0 , a=9.81m/s^2 , s=80m

Answer 7

Now, can u?

Answer 8

i can , but can you solve it??

Answer 9

but , what is the value of time 't'

Answer 10

@RaphaelFilgueiras @Rohangrr

Answer 11

U do not need t here..

Answer 12

As height is known

Answer 13

why??

Answer 14

ok!! then

Answer 15

v^2=u^2 +2as
v^2=0^2+2*9.81*80
v^2=1569.6
v=39.6 m/s

Answer 16

got it?

Answer 17

\[but, speed =\frac{distance}{time} \]

Answer 18

That formula only works when the speed is constant

Answer 19

ok!

Answer 20

When an object falls there is accleration

Answer 21

I need mass

Answer 22

total distance = 160m

Answer 23

And for constant accleration there are some equation of motion.

Answer 24

ya

Answer 25

v=u+at

Answer 26

\[or , a=(\frac{v-u}{t})\]

Answer 27

Its undergoing free fall accelaration

Answer 28

ya

Answer 29

Ya @myininaya

Answer 30

opps

Answer 31

Yep. @mayankdevnani

Answer 32

ok!!

Answer 33

And also there is v^2=u^2+2as

Answer 34

we don't know acc. =?

Answer 35

we need to calculte the speed of body upon arrival on the ground

Answer 36

wow.

Answer 37

Accleration =acclration due to gravity=9.81m/s^2

Answer 38

but v =?

Answer 39

v= 0

Answer 40

right/wrong

Answer 41

u=0

Answer 42

screen-capped

Answer 43

u need to calculate v

Answer 44

u= 0 why??

Answer 45

any reason?

Answer 46

If U throw a ball upward with velocity v then ,