Abel is not sure why, from h = vi2 sin2 θi 2g , the height the tennis ball reaches is maximum when θi = 90°, and asks kato to explain. which of kato's responses is correct? "when θi = 90°, sin2 θi = sin(2θi) = 1, which is its maximum value, so h is maximum." "when θi = 90°, sin2 θi is maximum, so h is maximum." "when θi = 90°, sin θi = 1, sin2 θi = 2 · 1 = 2, which is its maximum value, so that means h is maximum." "when θi = 90°, sin2 θi is minimum, so h is maximum."

an enlarged virtual image

compass can be used day and night, cloudy or sunny

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

answeralert drivers who drift off the road;