Question

a kid throws a ball up with some initial speed comment on magnitude and sign of acceleration and velocity of ball​

Answer 1

A kid close up a ball with some initial speed.

• Let the initial velocity be u .

• Also, let's consider downwards vector be negative.

Now, we know that gravitational acceleration is directed towards the earth (i.e. downwards).

Hence, sign of acceleration (a) is -g.

$\boxed{a= - g}$

Now, for velocity vector, since initial velocity is directed upwards, its sign will be positive.

$\boxed{v_{initial} = + u}$

Hope It Helps.