A projectile is launched at an angle of 45 degrees with a velocity of 250 m/s. If air resistance is neglected, the magnitude of the horizontal velocity of the projectile at the time it reaches maximum altitude is equal to

The horizontal velocity of the projectile at the time it reaches maximum altitude approximately equal to 131.331 meters per second.

Explanation:

From Mechanical Physics we understand that projectile motion is the combination of a horizontal motion at constant velocity and a vertical uniform accelerated motion due to gravity. Then, the horizontal velocity of the projectile (), measured in meters per second,  remains constant during motion. That is:

(Eq. 1)

Where:

- Initial velocity of the projectile, measured in meters per second.

- Launch angle above the horizontal, measured in sexagesimal degrees.

If we know that and , then horizontal velocity of the projectile at the time it reaches maximum altitude is:

The horizontal velocity of the projectile at the time it reaches maximum altitude approximately equal to 131.331 meters per second.

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min