Question

Consider two cars A & B in motion along a straight path. Let us compare the time taken
by Car A and Car B to travel 100 m. Car A is moving with constant speed of 72 km/h
whereas Car B is accelerated uniformly from 36 km/h to 108 km/h for 50 m, on
encountering a hurdle it slows down back to 36 km/h for next 50 m.
36 km/h 108 km/h
50 m
B
108 km/h 36 km/h
50 m
Analysis
1. Time taken by Car A to reach the destination ________________.
2. Time taken by Car B to reach the destination ________________.
3. Did accelerating to a high speed enable the second driver to complete the journey in less time ?
Write down five ways by which driving at an optimum steady speed proves to be beneficial & safe.

Answer 1

Answer:

90 km/h

Explanation:

ᴀᴠᴇʀᴀɢᴇ sᴘᴇᴇᴅ = ᴛᴏᴛᴀʟ ᴅɪsᴛᴀɴᴄᴇ / ᴛᴏᴛᴀʟ ᴛɪᴍᴇ

72+108= 180/2x

2x = ʟᴇᴛ's ᴛᴀᴋᴇ ᴅɪsᴛᴀɴᴄᴇ ғʀᴏᴍ ᴀ ᴛᴏ ʙ ᴀs x

ᴀɴᴅ ғʀᴏᴍ ʙ ᴛᴏ ᴀ ᴀs x, sᴏ x+x = 2x

ᴀᴠᴇʀᴀɢᴇ sᴘᴇᴇᴅ = 90 ᴋᴍ/ʜ

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