Find the speed of the object after 4 seconds

[annalian]

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

 

[cnh1995]

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

Right.

 

[haruspex]

Right.

Except for the units.