Copper(I) chloride, commonly called cuprous chloride, is the lower chloride of copper, with the formula CuCl.
Answer:
B
Explanation:
acceleration = change in speed / change in time
for 1, speed increases over time, so positive acceleration
for 3, speed decreases over time, so negative acceleration (or deceleration)
Answer:
The velocity relative to the surface of the ice is 6.5 m/s.
Explanation:
Given that,
Mass of girl m= 45.0 kg
Mass of plank M= 150 kg
Velocity = 1.50 m/s
We need to calculate the velocity relative to the surface of the ice
Using conservation of momentum

Here,
because plank at rest

Put the value into the formula


Hence, The velocity relative to the surface of the ice is 6.5 m/s.
It is because it damages the tissue and kills body cells. It could also lead to cancer.