Question

$\huge{ \bold{ \red{ \mid{underline{ \overline[Free \: point ♡♡♡}}}}}}$​

Answer 1

The answer to What has hands and a face, but can't hold anything or smile Riddle is "Clock".

THANKS FOR FREE POINTS

PLEASE MARK IN BRAINLIST

Answer 2

Hey mate,

Given Information,

Mass of the Plate = M

Mass of the bullets = m

Velocity of bullets = v

Velocity of rebound = v/2

Further, 'n' bullets are fired in a minute, implies 60/n bullets are fired in a second.

Now,

Impulse = Final Momenta - Initial Momenta

\longrightarrow⟶ I = mv - m(- v/2) [Sign Convention]

\longrightarrow⟶ I = 3mv/2

Now,

Force × Time = Change in Momentum

Since, the plate is held in air by forcing bullets. Applied Force = Weight = Mg.

\longrightarrow⟶ Mg × 60/n = 3mv/2

\longrightarrow⟶ v = 120Mg/3mn

⟶ v = 120Mg/3mn

\longrightarrow⟶ v = 40Mg/mn

Option (A) is correct.

You are the best friend in the world right....