H2.6 3/3 points (graded) A diver bounces straight up from a diving board, avoiding the diving board on the way down, and falls feet first into a pool. She starts with a velocity of 4.00 m/s and her takeoff point is 1.80 m above the pool. Take the positive direction as upwards. a. What is her highest point (in meters) above the board? Give your answer to three significant figures without units. V 0.82 0.82 b. How long (in sec) a time are her feet in the air? Give your answer to three significant figures without units. 1.139 V 1.139 c. What is her velocity (in m/s) when her feet hit the water? Give your answer to three significant figures without units. -7.16 V -7.16 Submit Show answer H2.7 1/1 point (graded) A ball is thrown straight up. It passes a 2.0 m high window 6 m off the ground on its path up and takes 0.23 s to go past the window. What was the ball's initial velocity in m/s (i.e the velocity when it was thrown)? Enter your answer to two significant figures without unit. 14.63 V
H2.8 2/2 points (graded) There is a 274 m cliff at Half Dome in Yosemite National Park in California. Suppose a boulder breaks loose from the top of this cliff. a. How fast in m/s will it be going when it strikes the ground? Give your answer to three significant figures without units. 73.28 V b. Assuming a reaction time of 0.300 s, how long a time (in sec) will a tourist at the bottom have to get out of the way after hearing the sound of the rock breaking loose (neglecting the height of the tourist, which would become negligible anyway if hit)? The speed of sound is 335.0 m/s on this day. Give your answer to three significant figures without units. 6.36 V