What is the magnitude of the velocity at time t = 15.0 s?

Physics
Tutor: None Selected Time limit: 1 Day

4. A projectile is fired at time t = 0.0 s from point 0 at the edge of a cliff, with initial velocity components of Vox = 30 m/s and V oy = 100 m/s The projectile rises, and then falls into the sea at point P. The time of flight of the projectile is 25 s. Assume air resistance is negligible. 

https://tcan4424-oakcliff-ccl.gradpoint.com/Resour...

What is the magnitude of the velocity at time t = 15.0 s?

May 18th, 2015

Assuming there is no air friction,

We have

Vox = 30 m/s
Voy = 100 m/s
time of flight = 25.0 s

At t = 100 s max height is reached
At t = 15.0 s projectile is moving upwards

Vy at t=15 s = Voy - gt = 100 - (9.81)(15) = 100 - 147 = -47 m/s
Vx at t=15 s = Vox = 30 m/s

Size of velocity at t = 15 s = √[(47)² + (30)²] = √(2209-900)

=

= √1309 = 36.18m/s ANS

May 18th, 2015

Did you know? You can earn $20 for every friend you invite to Studypool!
Click here to
Refer a Friend
...
May 18th, 2015
...
May 18th, 2015
Dec 9th, 2016
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer