Question

an object of mass 50kg is accelerated uniformly from a velocity of 4m/s to 8m/s in 8 seconds. calculate the initial and final momentum of the object . also find the magnitude of the force exerted on the object . Please answer it fast it's urgent

Answer 1

v-u/t = a ( from Ist equation of motion)

it's your answer brother

Answer 2

Explanation:

The mass of the object, m = 50 kg

Initial speed of the object, u = 4 m/s

Final speed of the object, v = 8 m/s

1. Initial momentum of the object is given by :

$P_i=m\times u$

$P_i=50\ kg\times 4\ m/s$

$p_i=200\ kg-m/s$

2. Final momentum of the object is given by :

$P_f=m\times v$

$P_f=50\ kg\times 8\ m/s$

$p_f=400\ kg-m/s$

3. The force exerted on the object is given by :

$F=m\times a$

$F=m\times \dfrac{v-u}{t}$

$F=50\times \dfrac{8-4}{8}$

F = 25 N

Hence, this is the required solution.