Sally started at the starting point.
She walked 10m forward. So far, she walked 10m, and she was 10m from the starting point.
Then she walked 5m backward. So far, she walked 15m, but she was only 5m from the starting point.
The distance she walked was 15m. But her displacement is how far she is from the starting point ... that's only 5m
Displacement = 5 meters
Distance = 15 meters
Displacement is 10m less than distance walked. <em>(B)</em>
===> If she kept going and walked <u><em>another </em></u>5m backward, she would be back where she started. The total distance she walked would be 20m, and her displacement would be zero !
Answer:
Cross over
Explanation:
Your arms are CROSSING OVER. Ill add a comment to confirm this is correct later. If not, ill provide the correct answer. But im confident its cross over
Answer:
A. It is made of tissues that can conduct electricity, a required function in a system.
Explanation:
The nervous system helps all the parts of the body to communicate with each other. It also reacts to changes both outside and inside the body. The nervous system uses both electrical and chemical means to send and receive messages.
Answer:
The wave speed is 2.8 m.
Explanation:
Wavelength = 1.4 m
frequency, f = 2 Hz
the wave speed is given by
wave speed = wavelength x frequency
wave speed = 1.4 x 2 = 2.8 m
option (D) is correct.
Atoms<span> are made of three types of sub-atomic particle: neutrons and protons in the nucleus and electrons orbiting the nucleus. </span>Some<span> materials are </span>radioactive<span> because the nucleus of each </span>atom<span> is unstable and gives out nuclear radiation in the form of alpha particles, beta particles or gamma rays.</span>
