A rock is tossed straight up with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep. A. What is the rock's velocity as it hits the bottom of the hole?
B. How long is the rock in the air, from the instant it is released until it hots the bottom of the hole?

The slotted link is pinned at o, and as a result of rotation it drives the peg p along the horizontal guide. compute the magnitude of the velocity and acceleration of p along the horizontal guide. compute the magnitudes of the velocity and acceleration of p as a function of θ if θ=(3t) rad, where t is measured in seconds.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader