a) What is the importance of universal law of gravitation? b) A car falls off a ledge and drops to the ground in 0.5sec. Let g = 10m/s2, (i) What is its speed on striking the ground? (ii) What is its average speed during the 0.5sec? (iii) How high is the ledge from the ground?
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ᴛʜᴇ ɪᴍᴩᴏʀᴛᴀɴᴄᴇ ᴏꜰ ᴜɴɪᴠᴇʀꜱᴀʟ ʟᴀᴡ ᴏꜰ ɢʀᴀᴠɪᴛᴀᴛɪᴏɴ ʟɪᴇꜱ ɪɴ ᴛʜᴇ ꜰᴀᴄᴛ ᴛʜᴀᴛ ɪᴛ ᴩʀᴏᴠᴇꜱ ᴛʜᴀᴛ ᴇᴠᴇʀy ᴏʙᴊᴇᴄᴛ ɪɴ ᴛʜᴇ ᴜɴɪᴠᴇʀꜱᴇ ɪꜱ ᴀᴛᴛʀᴀᴄᴛᴇᴅ ʙy ᴇᴠᴇʀy ᴏᴛʜᴇʀ ᴏʙᴊᴇᴄᴛ ɪɴ ᴛʜᴇ ᴜɴɪᴠᴇʀꜱᴇ ʙy ᴛʜᴇ ᴠɪʀᴛᴜᴇ ᴏꜰ ᴛʜᴇɪʀ ᴍᴀꜱꜱᴇꜱ.
ᴛ = 0.5ꜱ
ɢ = 10ᴍꜱ-²
• ᴜɴᴅᴇʀ ꜰʀᴇᴇ ꜰᴀʟʟ,
ᴀ = ɢ
ᴜ = 0
ᴠ = ᴜ + ᴀᴛ
ᴠ = 0 + 10×0.5
ᴠ = 5 ᴍꜱ-²
• ᴀᴠᴇʀᴀɢᴇ ꜱᴩᴇᴇᴅ,
ᴜ+ᴠ/2
0+5/2
= 2.5ᴍꜱ-²
•ɴᴇᴡᴛᴏɴ'ꜱ ᴇq. ᴏꜰ ᴍᴏᴛɪᴏɴ, ᴜ=0
ʜ = ᴜᴛ + 1/2ɢᴛ²
ʜ = 1/2 × 10 × (0.5)²
= 1.25ᴍ
❤️ʜᴏᴩᴇ ᴛʜɪꜱ ʜᴇʟᴩᴇᴅ yᴏᴜ❤️
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