Salam it frinds ..
Dosto mera simple sa swal he dosto sawl ye he ke hem log mass ko define krte he jase the quntity of matter per dosto muje ye pochna he ke whts poroduction of mass yani ager kasi body ka mass he leken ose wo mass melta kahan se he e.g 1 book he os ki mass he leken ose wo mass mella kahan se to plz dosto es ka muje batae i w8ing
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