A ball is thrown vertically upward with a speed of 30 m/s. The magnitude of its displacement after 4 s will be ______ (Take g = 10 m/s2.)
- A.50 m
- B.40 m
- C.30 m
- D.15 m
Show answer
Put the values straight into s equal to u t minus half g t squared, taking upward as positive: 30 into 4 gives 120, half of 10 into 16 gives 80, and the difference is 40 metres.
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