What is the answer?

A student compared the speeds at which a large and a small marble rolled down an inclined plane. In order to make the findings more reliable, the student should

OPTIONS:
- release the marbles at different heights.
- repeat the experiment several times.
- tilt the plane at different angles.
- use two marbles that are the same size.
repeat the experiment several times.
Vad är svaret? En elev jämförde de hastigheter med vilka en stor och en liten marmor rullade ner ett lutande plan. För att göra fynden mer tillförlitliga bör studenten ALTERNATIV: - släppa kulorna på olika höjder. - Upprepa experimentet flera gånger. - luta planet i olika vinklar. - använda två kulor som är lika stora.
What's the answer? One student compared the speeds with which a large and a small marble rolled down an inclined plane. To make the findings more reliable, the student should ALTERNATIV: - drop the bullets at different heights. Repeat the experiment several times. - tilt the plane at different angles. - use two bullets of equal size.
Upprepa försöket flera gånger.
Repeat the test several times.