Expression : vf2 = select from the variables below to write your expression. note that all variables may not be required. β, θ, a, b, d, g, h, j, k, m, n, p, s, t, v0 part (b) if the slide is 4.0 m long and the child's final speed is vf = 5.0 m/s, what is their initial speed, in meters per second? numeric : a numeric value is expected and not an expression. v0, max = part (c) when starting from rest, how long, in seconds, does it take the child to reach the bottom of the slide? numeric : a numeric value is expected and not an expression.

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?