# We have seen that if several observers watch two

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9. We have seen that if several observers watch two events, labelled A and B, one ofthem may say that event A occurred first, but another may claim that it was event Bthat did so. What would you say to a friend who asked you which event really did occurfirst?
10. If you were travelling away from the Earth at 0.50c, would you notice a change inyour heartbeat? Would your mass, height, or waistline change? What wouldobservers on Earth using a telescope to see you say about you?
Activity 3: SOLVE ME1. A 25 kg rock is accelerated to a speed of 0.98c.a. What would the mass of this rock be at this speed?
b. How much energy would be associated with the rock at rest? At this speed?
2. It takes 2.3 x 1010 J of energy to operate a long train for 1.0 h. How long could youoperate this train if 45 kg of matter could be converted to pure energy?
3. What is the momentum of a 5.0 kg rock travelling at 0.99c?

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