Physics, asked by meenakhadka2040, 11 months ago

a stone is thrown vertically upwards with an initial velocity of 20 metre per second .find the maximum height it reaches and the time taken by it to reaches and the time taken by it to reach the height.

Answers

Answered by Anonymous
7

hope it helps...........

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meenakhadka2040: thank u a lot...
Anonymous: keep asking
Anonymous: mark brainlist
meenakhadka2040: can u solve the next problem
aryan3664: what is your next problem
meenakhadka2040: A car is moving at a rate of 72 kilometre per hour.how far does the car move when it stops after 4 seconds.
Answered by aryan3664
2

A ball is thrown vertically upward with a speed of 20 m/s. When will it reach the maximum height? What is the maximum height reached?

Answer

These questions can be answered by making use of Newton's equations of motion. There are 3 equations of motions.

v=u+atv=u+at

s=ut+12at2s=ut+12at2

v2=u2+2asv2=u2+2as

Where,

v = final velocity

u = initial velocity

a = acceleration

t = time

s = distance

In your question, the initial velocity is given as 20m/s20m/s, i.e., u=20m/su=20m/s, the final velocity that the ball can achieve at the maximum height is 0m/s0m/s, hence, v=0m/sv=0m/s. Since the only first that cause the acceleration is gravity, a is taken as g where g is acceleration due to gravity, and had a value of 9.81m/s29.81m/s2. But for simplicity, we can take the value of a to be 10m/s210m/s2, so a=10m/s2a=10m/s2. Now, we need to find, what's s and t.

Note: Since the ball is thrown upwards, which is against the force of gravity (gravity always acts downwards), we need take the value of a (in this case, g) as −10m/s2−10m/s2.

Using the first equation,

v=u+atv=u+at

0=20−10t0=20−10t

10t=2010t=20

t=2t=2

Using the third equation,

v2=u2+2asv2=u2+2as

02=202+2×(−10)×s02=202+2×(−10)×s

20s=40020s=400

s=20s=20

Hence, the ball will travel for 2 seconds and complete a distance of 20 metres upwards.


aryan3664: Mark me as brainalist pls
meenakhadka2040: A car is moving at a rate of 72 kilometre per hour.how far does the car move when it stops after 4 seconds.
aryan3664: sorry i wouldn't help coz u didn't mark me as brainalist
Anonymous: brainlist for those who solve question not for those who just copy and paste
aryan3664: I don't know that wether you have solved it or not It may also possible that you may have copied idea from same platform that I did
aryan3664: Person has asked for the answer and I gave don't matter what was the source
aryan3664: by the way sorry
Anonymous: lol
aryan3664: Very big lol
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