Question

True/False: If the average speed of an object is zero, then its average velocity must be zero, but t its average velocity is zero, its average speed is not necessanily zero False An object is dropped from rest into seconds. How much deeper is the second pit, compared to the first pt? a pit, and accelerates due to gravity at roughly 10 m/s2. it hits the ground in 5 seconds A rock is then dropped from rest into a second pit, and hits the ground in 10 e two times deeper e four times deeper O five times deeper three times deeper If the fastest you can safely drive is 65 mi/h, what is the longest time you can stop for dinner if you must travel 460 mi in 9 4 h total? O You can't stop at all O 1.8 h 0 23h О 30 h

Answer 1

True S = ut + 1/2 at^2 S_1 = 1/2 times 10 times 5^2 = 125 m S_2 = 1/2 times 10 times 10^2 = 500 m S_2/S_1 = 4 four times deeper 65 mi/h 460 mi in 9.4 h t_1 = 460/65 = 7.07 hr t_2 = 9.4 t_2 - t_1 = 2.33 2.3 hour