A particle intially moving with a velocity 5m/s2 among -ve X direction. Its acceleration is along the -ve X axis. It is equal to 2m/s2.After 2s its acceleration is same in magnatitude but along the +ve X axis. Find its velocity and displacement after 10s of motion express the in terms of unit vectors

i think it's c. i'm not sure but i think so.

personal, she chose to do it.

i think its 100

i hope this !

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.