alleryStart learning →A runner covers 100 m in 20 s. What is her speed?
A5 m/s
B2 m/s
C0.2 m/s
D20 m/s
Answer & Solution
Correct answer: A. 5 m/s
Speed equals distance per unit of time, and 100 m divided by 20 s is 5 m/s.
Keep practising Motion and time
Browse all Motion and time questions for Olympiad (Class 7), or explore more Science topics.
Related questions
A body's distance is doubled and its time is halved. By what factor does its speed change?A vehicle covers 1 km every minute. What is its speed in km/h?Why were mercury and gridiron pendulums invented in the 1700s?Why must a pendulum clock be fixed firmly to a sturdy wall?What is the SI unit of the period of a pendulum?A pendulum makes 20 oscillations in 40 s. What is its period?A pendulum takes 2 s per oscillation. How many oscillations occur in 1 minute?What replaced pendulum clocks as the world's best timekeepers?