Question: a body of mass 30 kg moving north a velocity of 0.5 ms-1 subjected of 15 N North for 2.7 s. Calculate the final velocity of the body.
Answer:
14 m/s
Explanation:
From the question,
F = ma......................... Equation 1
make a the subject of the equation
a = F/m....................... Equation 2
Given: F = 15 N, m = 30 kg.
Substitute these values into equation 2
a = 15/3
a = 5 m/s².
Using,
a = (v-u)/t.................... Equation 3
Where v = final velocity, u = initial velocity, t = time.
Given: u = 0.5 m/s, t = 2.7 s and a = 5 m/s²
Substitute these values into equation 3
5 = (v-0.5)/2.7
(v-0.5) = 5×2.7
v-0.5 = 13.5
v = 13.5+0.5
v = 14 m/s
