Question

In the formula vy = ayt, what is the value of ay for an object in projectile motion? –9.8 m/s2 0 m/s2 m/s2 1.0 m/s2

Answer 1

The correct answer to the question is $-\ 9.8\ m/s^2$.

EXPLANATION:

As per the question, the formula is given as $v_{y} =\ a_{y}t$.

Here, $v_{y}\ and\ a_{y}$ are the vertical velocity and vertical acceleration.

We are asked to calculate the value of $a_{y}$ for an object in projectile motion.

As motion of the body is projectile in nature, so, the only force that affects the vertical motion of the body is the force of  gravity.

Hence, the vertical acceleration is noting else than the acceleration due to gravity .

The value of acceleration due to gravity  $[g]\ =\ 9.8\ m/s^2$.

It is always directed towards the centre of the earth i.e in vertically downward direction. For vertically downward motion, the sign convention for g is negative.

Hence, the value of $a_{y} =g\ =\ -9.8\ m/s^2$

Answer 2

Answer:

The correct option is (A)

Explanation :

The formula is given as :

Where,

is vertical component of velocity.

is the vertical component of acceleration.

In a projectile motion, the particle moves in a path under the influence of gravity.

So, the vertical component of acceleration is -g i.e acceleration due to gravity.

Hence, the correct option is (a) " ".