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Physics · Mechanics
A projectile is launched at 20 m/s at 30° to the horizontal. Calculate the maximum height reached. (g = 10 m/s²)
AI feedback
H = (u² sin²θ) / 2g. You used the total time-of-flight formula instead.01 / Instant feedback
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After every practice question, the AI marks your answer and explains the error: which formula you reached for, why it fails here, and what to use instead. Short-answer questions get the same treatment: graded with written feedback, not just a score.
A car accelerates uniformly from rest to a velocity of 20 m/s in 10 s. What is the distance covered?
Where the working went wrong
You used s = vt, which assumes constant velocity. The car accelerates from rest, so use s = ½(u+v)t = ½ × 20 × 10 = 100 m.
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