A child riding a sled is pulled down a snowy hill by a force of 85 N. If the child and sled have a combined mass of 75 kg, what is their speed after 7.5 s? Assume the child and sled are initially at rest.

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Relate the real life phenomenon with each branch physics; 1; mechanics 2; heat 3; sound 4; light(optics) 5; electricity& magnetism 6; atomic physics 7; nuclear physics 8; plasma physics 9; geophysics

Which atomic model is missing from this set