In a ballistic pendulum experiment, projectile 1 results in a maximum height h of the pendulum equal to 2.6 cm. A second projectile (of the same mass) causes the the pendulum to swing twice as high, 5.2 cm. The second projectile was how many times faster than the first?

The second projectile is times faster than the first projectile.

Explanation:

Mass of first projectile = m

height = 2.6 cm

Height = 5.2 cm

Let velocity of first projectile = V

Velocity of first projectile = V'

From conservation of momentum principal

m V = (m + m) V'

V' =

Therefore velocity is directly proportional to the height.

Since

Therefore the second projectile is times faster than the first projectile.

it is the second option.

i think the answer is a, hope this is right, that would be my best guess.