An athlete makes a long jump and follows a projectile motion. Air resistance is
negligible.
Which one of the following statements is true about the athlete?
(a) The athlete has a constant horizontal and vertical velocities.
(b) The athlete has a constant horizontal velocity and constant
downward acceleration.
(c) The athlete has a constant upward acceleration followed by a constant downward
acceleration.
(d) The athlete has a constant upward velocity followed by a constant downward velocity.
Answers
Answer:
THE CORRECT OPTION IS "B".
Explanation:
BECAUSE WHEN A PARTICLE IS MOVING IN A PROJECTILE MOTION ONLY VERTICAL VELOCITY CHANGES (VEL.. IN Y AXIS) BUT VELOCITY IN X AXIS REMAIN CONSTANT.AND ITS ACLN OR DOWNWARD ACLN IS 'g'.
Answer:
The correct option for this question is (b) The athlete has a constant horizontal velocity and constant downward acceleration.
Explanation:
What impact does air resistance have?
Air resistance causes a projectile's movement through the air to slow down. A projectile's horizontal component will become less due to air resistance. Even though the impact of air resistance on a projectile is minimal, it must be taken into account if the projectile's horizontal component is to be increased. Air resistance is proportional to the area and the square power of velocity, whereas the kinetic energy of the jumper is proportional to body mass and the square power of velocity. As a result, the influence of air resistance on the jump trajectory increases as the area grows in relation to mass.
Thus, the athlete must run as quickly as he can and then jump as high as he can at the point of takeoff in order to jump as far as possible in the long jump. In this instance of projectile motion, the maximum distance is attained at the takeoff by maximizing both horizontal and vertical velocity.