The speed of the flaming ball is the rate of change in distance travelled. Hence the speed of the flare at time u seconds is: √(z' (u))² + (v′(u)) ². d v(u) = = s(u) = ₁ du • After 5 seconds the ball is moving at a speed of + • The initial speed of the ball is + metres per second (to the nearest integer). metres per second (to the nearest integer).

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