Blake accelerates a sled carrying his little sister from rest. The sled and sister have a total mass m, the coefficient of kinetic friction between the sled and the ground is μk , and Blake causes the rope connected to the sled to have a constant tension force T that makes an angle θ with the horizontal. Any frictional forces between the sled and the snow are negligible.

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.

A10-kg isto a of 10 m at aa0.9 kg/m.30 kg of ,at aas10-m .. ( 9.8 m/s2 g.)