Question #9ae53

1 Answer
Feb 27, 2018

See below.

Explanation:

#S_1-> h_1 = y_1-1/2 g t^2#
#S_2-> h_2 = y_2-1/2g(t-t_2)^2#

#h_1-h_2 = y_1-y_2-1/2g(t^2-(t-t_2)^2) = d# or

#(2/g) (h_1-h_2-d)=2t t_2-t_2^2# and

#t = ((2/g) (h_1-h_2-d)+t_2^2)/(2t_2)#

here

#h_1 = 0#
#h_2 = -5#
#t_2 = 1#
#d = -15#
#g = 10#

giving #t = 2.5# [s]