The discussion centers on calculating the speed of an object thrown horizontally after 4 seconds, where the speed vector forms a pi/4 radians angle with the horizontal after 3 seconds. The key equations used include v=gt for vertical velocity, resulting in a vertical speed (vy) of 40 m/s at t=4 seconds. The horizontal speed (vx) equals the vertical speed at the angle of pi/4 radians, leading to a resultant speed of 50 m/s calculated using the Pythagorean theorem. The only correction noted was regarding the units of measurement.
PREREQUISITESStudents studying physics, particularly those focusing on kinematics and projectile motion, as well as educators seeking to clarify concepts related to horizontal motion and vector analysis.
Right.annalian said:Homework Statement
An object is thrown horizontally and after 3 seconds the speed vector forms the angle pi/4 radians with the horizontal direction. FInd the speed after 4 seconds.
Homework Equations
v=gt
The Attempt at a Solution
As it forms the angle pi/4 radians, vx=vy, so
v0=gt=3*10=30
vy when t=4 is 40m
v=sqrt(vx^2+vy^2)=50m Am I right
Except for the units.cnh1995 said:Right.