Question

An object falls from a height of 15 m in 0.5 sec. What is the average speed of the object?

• A. 1.85 m/s
• B. 20 m/s
• C. 2.45 m/s
• D. 2.86 m/s

Answer 1

Answer: (C)

2.45 m/s

Distance (s) = 15m, Time (t) = 0.5 sec.,
initial velocity (u) = 0 m/s, acceleration due to gravity = 9.8 m/s
To find final velocity,
$v=u+at$
$v=o+9.8\times 0.5$
$v=4.9m/s$
Average speed $=\frac{u+v}{2}$
$=\frac{0+4.9}{2}=2.45m/s$