Question

velocity of body changes from 18 km per hour to 90 km per hour in 10 second calculate the acceleration in the body

Answer 1

Hlo        Given         Velocity changes from 18 to 90 km/hr      Change in velocity = 90-18                               Δv.  = 72 km/hr   Firstly we should convert km/hr in m/s  Now,          ( 72*1000) / (60*60) m/s    => 20 m/s  Now We know that change in velocity = 20 m/s   Then,         Acceleration = change in velocity/time     a = 20/10    a = 2 m/s²  Now the ans is        Acceleration  = 2 m/s²  Hope it helps :-)

Answer 2

Given in the pic. Always remember to convert velocity to m/s .