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①• A force is applied on a body of mass 20 kg moving with a velocity of 40 m/s. The body attains a velocity of 50 m/s in 2 s. Calculate the work done on the body.②• A girl of mass 35 kg climbs up from the first floor of a building at a height 4 m above the ground to the third floor at a height 12 m above the ground. What will be the increase in her gravitational potential energy? (Take g = 10 m/s²)​

Answer»

is applied on a body of mass 20 kg moving with a velocity of 40 m/s. The body attains a velocity of50 m/s in 2 s. Calculate the work done on the body.─━─━─━─━─━─━─━─━─━─━─━─━──━─━─━─━─━─━─━─━─━─━─━─━──━─━─━─━─━─━─━─━─━─━─━─━──━─━─━─━─━─━─━─━─━─━─━─━──━─━─━─━─━─━─━─━─━─━─━─━──━─━─━─━─━─━─━─━─━─━─━─━─❥︎We know, ─━─━─━─━─━─━─━─━─━─━─━─━─On substituting the value from equation (1), we get─━─━─━─━─━─━─━─━─━─━─━─━─On substituting the value of 'a' from equation (1), we get─━─━─━─━─━─━─━─━─━─━─━─━──━─━─━─━─━─━─━─━─━─━─━─━─A girl of mass 35 kg climbs up from the first floor of a BUILDING at a height 4 m above the GROUND to the third floor at a height 12 m above the ground. What will be the increase in her gravitational potential energy? (Take G = 10 m/s²)─━─━─━─━─━─━─━─━─━─━─━─━──━─━─━─━─━─━─━─━─━─━─━─━──━─━─━─━─━─━─━─━─━─━─━─━──━─━─━─━─━─━─━─━─━─━─━─━──━─━─━─━─━─━─━─━─━─━─━─━─



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