榧庡皻
v
0
t
t
1
t
2
t
3
楂樹腑鐗╃悊瀛︿範鏉愭枡
锛堥紟灏?/p>
**
鏁寸悊鍒朵綔锛?/p>
1.3
杩愬姩蹇參涓庢柟鍚戠殑鎻忚堪鈥斺�旈�熷害
銆?/p>
缁忓吀婕旂粌
銆?/p>
渚?/p>
1
锛?/p>
鐭窇杩愬姩鍛樺湪
100 m
姣旇禌涓紝浠?/p>
8 m/s
鐨勯�熷害杩呴�熶粠璧风偣鍐插嚭锛屽埌
50 m
澶勭殑閫熷害鏄?/p>
9
m/s
锛?/p>
10s
鏈埌杈剧粓鐐圭殑閫熷害鏄?/p>
10.2 m/s
锛屽垯杩愬姩鍛樺湪鍏ㄧ▼涓殑骞冲潎閫熷害鏄?/p>
(
)
A
锛?/p>
9 m/s
B
锛?/p>
10.2 m/s
C
锛?/p>
10 m/s
D
锛?/p>
9.1 m/s
渚?/p>
2
锛?/p>
涓�鐗╀綋鍋氬彉閫熺洿绾胯繍鍔紝
鑻ュ墠
t/3
鍐呯殑骞冲潎閫熷害涓?/p>
6m/s
锛?/p>
鍚?/p>
2t/3
鏃堕棿鐨勫钩鍧囬�熷害涓?/p>
9m/s
锛屽垯杩欐鏃堕棿
t
鍐呯殑骞冲潎閫熷害涓?/p>
______
锛庤嫢鐗╀綋鍓嶄竴鍗婁綅绉荤殑骞冲潎閫熷害涓?
锛屽悗涓�鍗婁綅绉荤殑骞冲潎閫熷害涓?
锛屽垯杩欐浣嶇Щ鐨勫钩鍧囬�熷害涓?/p>
_______
锛?/p>
渚?/p>
3
锛?/p>
.
濡傚浘鎵�绀烘槸涓�涓墿浣撶殑
v-t
鍥捐薄锛?/p>
浠庝互涓嬩笁涓柟闈㈣鏄庡畠鐨勯�熷害鏄�庢牱鍙樺寲鐨勶紵
锛?/p>
1
锛夌墿浣撴槸浠庨潤姝㈠紑濮嬭繍鍔ㄨ繕鏄叿鏈変竴瀹氱殑鍒濋�熷害锛?/p>
锛?/p>
2
锛夎繍鍔ㄧ殑鏂瑰悜鏄惁鍙樺寲锛?/p>
锛?/p>
3
锛夐�熷害鐨勫ぇ灏忔槸鍚﹀彉鍖栵紵鎬庢牱鍙樺寲锛?/p>
渚?/p>
4
锛?/p>
鐢插湴鍙戠敓鍦伴渿锛屼箼鍦版祴寰楀湴闇囩旱娉㈠埌杈剧殑鏃跺埢涓庡湴闇囨í娉㈠埌杈剧殑鏃跺埢鐩稿樊鈻?/p>
t
锛屽凡鐭?/p>
绾垫尝鐨勯�熷害涓?/p>
v
1
锛屾í娉㈢殑閫熷害涓?/p>
v
2
锛?/p>
v
1
锛?/p>
v
2
锛岀敱姝ゅ彲鐭ワ紝鐢层�佷箼涓ゅ湴鐨勮窛绂讳负澶氬ぇ锛?/p>
銆?/p>
寮哄寲璁粌
銆?/p>
1.
涓嬪垪鍏充簬骞冲潎閫熷害鍜岀灛鏃堕�熷害鐨勮娉曟纭殑鏄紙
锛?/p>
A
锛庡钩鍧囬�熷害
t
x
v
飦?/p>
飦?/p>
飥?
锛屽綋
t
飦?/p>
鍏呭垎灏忔椂锛岃寮忓彲琛ㄧず
t
鏃跺埢鐨勭灛鏃堕�熷害
B
锛庡寑閫熺洿绾胯繍鍔ㄧ殑骞冲潎閫熷害绛変簬鐬椂閫熷害