For the ball kicked at 20 m/s at 30° above the horizontal (ignore air resistance, m/s²), what is its range on level ground?
Answer and explanation
Correct answer: A. 35 m
- Step 1: Vertical: m/s up; time of flight s.
- Step 2: Horizontal speed m/s.
- Step 3: Range m.
Answer
35 m.
Why not the others: 17 m: the horizontal speed was used as the range. 70 m: the time of flight was doubled. 20 m: the speed was used as the range.
Practise more Our Dynamic Universe.
Free questions with an explanation for every one, and full timed Scottish Highers mock tests.
More Our Dynamic Universe questions
- A car moving at 5.0 m/s accelerates uniformly at 2.0 m/s² for 6.0 s. What is its final speed?
- A trolley accelerates from rest at 3.0 m/s² for 4.0 s. How far does it travel?
- A runner at 4.0 m/s accelerates at 2.0 m/s² over 15 m. What is the final speed to 2 significant figures?
- A ball is kicked at 20 m/s at 30° above the horizontal. What is the vertical component of its initial velocity?
- What is the momentum of a 1200 kg car travelling at 15 m/s?
- A 2.0 kg trolley moving at 3.0 m/s collides with a stationary 1.0 kg trolley and they stick together. What is their common speed?