1.work done by a force .......

a.is independent of da frame of refrence

b.is same in all frame of refrence

c.is same in all inertial frames

d.none of dis

2.a ball is thrown vertically upwards with a certain velocity

a.during its upwards motion work done by gravity is negative

b.during its downwards motion work done by gravity is positive

c.at da highest point work done by gravity is not defined

d during da complete motion work done by gravity is zero

two blocks of masses m1 and m2 are placed on a frictionless horizontal  floor and are attached by a spring of spring const K .........on da block on right hand side a force of 2f and on da block on left a force of f  N is applied ....both forces in da direction away from spring i.e  against da spring.find da max extension in spring???????

whats da effect of addin inert gas in an rxn at pressure?????????????

and plz tell how it does ?????

what i thought is dat ..... wen inert gs is added to da system it willl exert some pressure ...........but pressure to be constant,pressure exerted by da system[products + reactants] sdh decrease therefore no moles shd decrease but its acllty reverse .......equi shifts towards more no of moles

what is da maximum value of da expression         

 modulus of   ( sinsq x + 2asq ) raised to 1/2 - (2a sq-1-cos sq x ) raised to 1/2    ???????????

wats da co efficient of 16 in (1-x)^-1 * (1-x² )^-1 * (1-x³ )^-1 * (1-x⁴ )^-1  ?????????