I know that the answer is a but what are the steps ?? A rock is...

Question

Question

I know that the answer is a but what are the steps ??

Answer 1

Answer #1

Using the equation of motion:

s = ut + 0.5*at^2

Here, u = 0 as it starts off from rest

a = -9. 8 m/s2

So, -50 = 0 - 0.5*9.8*t^2

So, t = 3.18 s <----- answer

Now, using the equation of motion:

v = u + at

So, v = 0 + 9.8*3.18

So, v = 31.2 m/s <------ answer

Answer 2

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