27The speed of sound in air at room temperature is about:A343 m/sB3 × 10⁸ m/sC30 m/sD1500 m/sView AnswerDiscussWorkspaceReportSaveEasy
29A body's mass is 60 kg on Earth. What is its mass on the Moon?A0 kgB10 kgC360 kgD60 kgView AnswerDiscussWorkspaceReportSaveMedium
30A body is thrown upwards. At its highest point, its:AVelocity is zero but acceleration is gBVelocity and acceleration are both zeroCAcceleration is zeroDVelocity is maximumView AnswerDiscussWorkspaceReportSaveMedium