Question

A particle moves in east direction with $15m/sec$ for $2$ sec then moves in north direction with $5m/s$ for $8sec$ .average velocity of the particle is:

• A. $1m/s$
• B. $5m/s$
• C. $7m/s$
• D. $10m/s$

Answer 1

The correct option is C $7m/s$

$V_1=15m/s,t_1=2s,v_2=5m/s,t_2=8s$

Speed of the particle for $2s$ is $15m/s$

$Distance=speed\times time,d=30m$

The Speed of the particle for next $8s$ is $5m/s$

$Distance=Speed\times time,d=40m$

Average speed $=\frac{40+30}{8+2}=7m/s$