1. A small stone is projected vertically upwards with speed 20 m s-1 from a point O which is 5 m above horizontal ground. The stone is modelled as a particle moving freely under gravity. Find (a) the speed of the stone at the instant when it is 2 m above the ground, (b) the total time between the instant when the stone is projected from O and the instant when it first strikes the ground.

the answer is stop cheating on things stoopid

step-by-step explanation:

im eatin up the 44

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

the answer would be d

straight away you can eliminate a and c because not all books contain a scientific skill because some may be fiction. c is also wrong because it saids that the only way children can learn is through books which is incorrect.

b is also wrong because reading can be a scientific skill but not always, therefore it is wrong which leaves you with d, the correct answer since it said that it can children learn.

hope this ! : 3