Physics Revision

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Across
  1. 4. Momentum is always?
  2. 5. Who thought up the laws of motion?
  3. 6. Unit of voltage
  4. 8. Speed that instant
Down
  1. 1. Unit of Energy
  2. 2. Another name for a converging lens
  3. 3. Difference in velocity over a period of time
  4. 7. Unit of momentum
  5. 9. Who's law is V = IR