2019:
उत्तर (B) आहे.
बल F असताना ब्लॉकची वेग व असतो. बल जास्त केल्यास 2F असताना ब्लॉकचा वेग √2v असेल.
2018:
उत्तर (D) आहे.
केंद्रित बलाने केलेला काम त्याच्या शक्तीच्या दिशेने असल्यामुळे शून्य आहे, कारण केंद्रित बल आणि कणाच्या हलविण्याच्या प्रवाहाच्या दिशेने असतो.
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