Share
A woman on a bridge 93.7 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hi
Question
A woman on a bridge 93.7 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 4.94 m more to travel before passing under the bridge. The stone hits the water 1.53 m in front of the raft. Find the speed of the raft.
in progress
0
Physics
3 years
2021-07-24T20:32:26+00:00
2021-07-24T20:32:26+00:00 1 Answers
35 views
0
Answers ( )
Answer:
0.779m/s
Explanation:
A woman on a bridge 93.7m high sights a raft floating at a constant speed
She drops a stone from rest in an attempt to hit the raft
The stone is released when the raft had 4.94m to travel before passing under the bridge
The stone hits the water 1.53 m in front of the raft
The first step is to calculate the distance
= 4.94 m-1.53 m
= 3.41m
The time can be calculated as follows
= √2(93.7)/9.8
= √187.4/9.8
= √19.12244
= 4.373 secs
Therefore the speed of the raft can be calculated as follows
Speed= 3.41/4.373
= 0.779m/s
Hence the speed of the raft is 0.779m/s