Question

a ball is projected vertically upwards with an inital speed of 20m/s on a planet where acceleration to gravity is 10m/s2 how long it will take to reach 10m​

Answer 1

Answer:

Time is 1 s.

Explanation:

In this case, Speed = Velocity,

Velocity = 20 m/s

g = 10 m/s²

Distance = 10 m

Final Velocity = 0 m/s

Let the final velocity be = v

Let the initial velocity be = u

SO,

v = u+at

Note : I have taken the value of acceleration as negative because the ball is going against the gravity.

0 = 20 - 10*t

0 = 20 - 10t

10t = 20

t = 2s

v² = u²+2as

0² = 400 + 2 * (-10) *s

0² = 400 - 20s

20s = 400

s = 20m

So, if in 2 seconds, the ball reaches 20m, so, in 1 s, it will reach 10 m.

Time = 1s

Hope this helps.