A girl kicks a soccer ball into the air with initial speed o

A girl kicks a soccer ball into the air with initial speed of 10 m/s. Neglect air resistance. Which of the following statements are true? \"the time the ball is in the air is independent of the angle at which it is kicked.\" \"the horizontal motion of the ball is independent of its vertical motion.\" \"the ball will always be moving when it is in the air.\" \"the ball is accelerating all the time when it is in the air.\" \"gravity always causes the velocity of the ball to increase.\" \"acceleration is zero at the highest point in the ball\'s trajectory.\" \"the height to which the ball rises depends on the ball\'s weight.\"

Solution

initial speed of the ball , u = 10 m/s

time of flight = 2 * u * sin(theta)/g

there is always gravity accelerating on the ball , and it accelerates all the time when it is in air.

height to which ball rises = (u * sin(theta))^2/g

it is independent of the weight

hence , the correct options are

B , D , C