A ball of mass 4.5 gram is thrown up with an initial speed of 18 m/s. What is the amount of the acceleration of the ball after 1.87 seconds of flight?

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction. true or false?

A4.0-cm tall light bulb is placed a distance of 32.0 cm from a concave mirror having a focal length of 16.0 cm. determine the image distance

Aplayground slide is 8.80 ft long and makes an angle of 25.0° with the horizontal. a 63.0-kg child, initially at the top, slides all the way down to the bottom of the slide. (a) choosing the bottom of the slide as the reference configuration, what is the system's potential energy when the child is at the top and at the bottom of the slide? what is the change in potential energy as the child slides from the top to the bottom of the slide? (include the sign of the value in your answer.)