Explanations & Calculations
- It is about using the formula of kinetic energy repeatedly.
- The mass of the object is unknown so getting it replaced yields the needed answer.
Ek85006300(2)÷(1),152v2v=21mv2=21m(152)⋯(1)=21m(v2)⋯(2)=85006300=8563×152ms−1
- Now you can get things simplified.
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