physics
posted by Ellen .
A projectile is fired straight up at a speed of 15 m/s.
How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 .

Vf = Vo + gt,
t = (Vf  Vo) / g,
t = (0  15) / 9.8 = 1.53s.
Respond to this Question
Similar Questions

Physics
A projectile is fired straight up from a cliff which is 200 feet above ground with an initial velocity of 220 ft/sec. Assume that the only force affecting the projectile during flight is from gravity which produces a downward acceleration … 
Physics
A projectile is fired straight up at a speed of 16 m/s. How long does it take to reach the top of its motion? 
Physics
1) A particle travels between two parallel vertical walls separated by 16 m. It moves toward the opposing wall at a constant rate of 6.4 m/s. It hits the opposite wall at the same height. The acceleration of gravity is 9.8 m/s. a) … 
physics
A projectile is fired straight up at a speed of 15 m/s. How long does it take to reach the top of its motion? 
physics
a projectile is fired from the top of a building with an initial velocity straight upward at 40m/sec. the top of the building is 50 meters above the ground? 
Physics
A projectile is fired straight up at a speed of 13 m/s. How long does it take to reach the top of its motion? 
science
If a projectile is fired straight up at a speed of 13m/s. How long does it take to reach the top of its motion? 
Physics please help!!
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 … 
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 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 …