Which of the curves in the graph below best represent the vertical component Vy of the velocity versus the time t for a projectile fired at an angle of 45 above the horizontal??
1 Answer
Jun 28, 2017
D
After projectile is fired, initial vertical component of velocity decreases under retarding force of gravity, becomes stationary momentarily at the maximum height, then increases in the downward (-ve) direction as the projectile falls freely under gravity.
Explanation:
Vertical component of velocity of projectile is given by the kinematic expression
#v=u+at#
In our case
Acceleration due to gravity
Rearrange and notice that it represents a straight line. Compare it with standard equation.
Slope of the line is negative. Makes an angle greater than