Physics-- water gun?

Question

When a water gun is fired while being held horizontally at a height of 1.23m above ground level, the water travels a horicontal distance of 1.28m.

The acceleration of gravity is 9.81 m/s2.

A. Find the initial velocity of the water.

A child, who is holding the same gun in a horizontal position, is sliding down a 41º incline at a constant speed of 1.34 m/s. The child fires the gun when it is 1.4 m above the ground and the water takes .451 s to reach the ground.

b. How far will the water travel horizontally?

Answer 1

x(t)=vi*t
and
y(t)=1.23-.5*9.81*t^2
when x=1.28 and y=0, impact
1.28=vi*t
t=sqrt(1.23*2/9.81)

vi=2.56 m/s

For the child:
The sliding has a vertical and horizontal component

Horizontal: 1.34*cos(41)
Vertical: -1.34*sin(41)

Let's see if we agree with the 0.451 seconds to strike the ground
y(t)=1.4-1.34*sin(41)*t-.5*g*t^2
when y=0
Close, I get 0.452 seconds

The magnitude of the horizontal speed of the water is
2.56+1.34*cos(41)
so in 0.451 seconds, the water travels
1.61 meters

j

Answer 2

it is nicely an extremely complicated question to respond to, and a damaging ONE, too. Firing a gun with the barrel full of water is extremely different from firing a gun with a barrel full of air. one concern you will possibly desire to on no account do is attempt to fireside a gun whose barrel hasn't been completely drained of water - that could desire to explode the barrel. you could on no account wisely hearth JHP bullets underwater - on no account! the only ammo that is carried under water is cartridges with the two sealed casemouths and primer wallet. not one of the cheap WalMart manufacturers are possibly to proceed to exist being submerged for extra advantageous than, say, an hour. Now, firing any gun underwater may be extremely risky on your well being. some idiots who've tried this have long previous deaf for existence; some have given themselves longterm migraine issues; and, have self belief it or no longer, there are people who've given themselves, the two, heavily broken inner organs or maybe deadly coronary heart assaults from the effective water-transmitted percussion. in basic terms sticking the gun underwater and holding your head and physique out, might desire to result interior the gun exploding on your hand. Bullets, additionally, do no longer commute all that far or hit all that complicated underwater. With maximum handguns after 6 to eight ft you're unlikely to be hitting plenty tougher than a slingshot. each and every little thing seen, taking photos any gun underwater is risky, silly, ill-seen, and regularly ineffective. With basically 3 to 5 ft of effective distance an underwater, 'bang-stick' is a much extra perfect concept. (plenty extra wisely, 'muffled' too.)