Mirror: Reflects off of
Glass of water: Goes through
Dark Fabric: Absorbs into
0.0605J is your answer. Use the formula KE=1/2mv^2
its the the first one u said
Answer:
Explanation:
Given
Initial speed 
distance traveled before coming to rest 
using equation of motion

where v=final velocity
u=initial velocity
a=acceleration
s=displacement

for 
using same relation we get

divide 1 and 2 we get


So a distance if 213.32 ft is required to stop the vehicle with 80 mph speed
Each person is 80kg. 320/4