Physics please help!!
posted by Julia .
A projectile is fired at 45.0° above the horizontal. Its initial speed is equal to 42.5 m/s. Assume that the freefall acceleration is constant throughout and that the effects of the air can be ignored. What is the maximum height reached by the projectile?
At what time after being fired does the projectile reach this maximum height?

Vi = 42.5 sin 45 = 30 m/s
v = Vi  9.81 t
0 = 30  9.81 t
t = 3.06 seconds to top
h = 0 + Vi t  (1/2)9.81 t^2
h = 30(3.06)  4.9 (3.06)^2
= 91.8  45.9
= 91.7 m 
a ball thrown vertically upward from the top of a tower 60m high a velocity of 30ms what is the maximum height above the ground level.how long does it take to reach the ground
Respond to this Question
Similar Questions

physics
A projectile was fired at 35 degrees above the horizontal. At the highest point in its trajectory its speed was 200 m/s. If air resistance is ignored, the initial velocity had a horizontal component of 0. How is this possible? 
Physics
A cannonball is fired with initial speed v0 at an angle 30° above the horizontal from a height of 36.0 m above the ground. The projectile strikes the ground with a speed of 1.3v0. Find v0. (Ignore any effects due to air resistance.) … 
Physics
A projectile is fired at 65.0° above the horizontal. Its initial speed is equal to 37.5 m/s. Assume that the freefall acceleration is constant throughout and that the effects of the air can be ignored.At what time after being fired … 
physics
A projectile is fired into the air from the top of a cliff of height h = 208 m above a valley. Its initial velocity is v0 = 55.2 m/s at an angle θ = 54° above the horizontal. Where does the projectile land? 
Physics
A projectile is fired into the air from the top of a cliff of height h = 186 m above a valley. Its initial velocity is v0 = 64.8 m/s at an angle θ = 59° above the horizontal. Where does the projectile land? 
physics
A projectile is fired into the air from the top of a cliff of height h = 186 m above a valley. Its initial velocity is v0 = 64.8 m/s at an angle θ = 59° above the horizontal. Where does the projectile land? 
physics
A projectile is fired into the air from the top of a cliff of height h = 186 m above a valley. Its initial velocity is v0 = 64.8 m/s at an angle θ = 59° above the horizontal. Where does the projectile land? 
physics
A projectile is fired at 33.1° above the horizontal. Any effects due to air resistance are negligible. At the highest point in its trajectory, its speed is 15.5 m/s. Calculate the horizontal component of the initial velocity. 
physics
A projectile is fired at 30.0° above the horizontal. Its initial speed is equal to 172.5 m/s. Assume that the freefall acceleration is constant throughout and that the effects of the air can be ignored. What is the maximum height … 
Physics
A projectile is fired at 32.5° above the horizontal. Its initial speed is equal to 160.0 m/s. Assume that the freefall acceleration is constant throughout and that the effects of the air can be ignored. What is the maximum height …