Question

a body with the initial velocity of a 18km /hr accelerates uniformly at a rate 9 cm/s^2 over a distance of 200 m calculate the acceleration and final velocity

Answer 1

Initial velocity(u)= 18km/hr= 18×5/18=5m/s
acceleration = 9 cm/s^2
Change the acceleration into metre/sec^2
a= 9/100 m/s^2

v2=u2-2aS
v2= (5)^2- 2× 9/100×200
v2= 25- 36
v2= -9
v= - 3 m/s
Velocity can be negative or positive.