Question

Name: HW No 2 1. A darevevil plans to perform a very dangerous stunt by diving (viz., falling) from a height of 11.9 m (above the water's surface) into a small pool filled with water to a depth of 30 cm. What minimum deceleration will be required (in the water) to advert certain, mortal failure? 2. (a) Determine the average number of g's experienced by someone abruptly coming to rest from an initial velocity of 30 mph (such as in a car crash). Take the distance involved in coming to rest to be 10 cm. (b) Determine the time it takes to stop. 3. A student is running to catch the campus shuttle bus, which is stopped at the bus stop. The student is running at a constant speed of 6.0 m/s; she can't run any faster. When the student is still 60.0 m from the bus, it starts to pull away. The bus moves with a constant acceleration of 0.18 m/s2. (a) For how much time and (b) how far does the student have to run before she overtakes the bus? 4. A ball is thrown straight up from the edge of the roof of a building of height 60.0 m. A second ball is dropped from the roof 2 s later. What must be the initial speed of the first ball if both are to hit the ground at the same time?

Answer 1

ACCORDING to the HOMEWORKLIB RULES we have allow answer one question at a time. soln=1