Question

An object of mass 200 kg is accelerated uniformly from a velocity of 5 ms-1 to 15 ms-1 in 5 s. Calculate the change in the momentum of the object and also find the force acting on it​

Answer 1

Answer:

Correct Answer is 50 N

Mass of object, m=100kg;

$\sf \: initial \: velocity, \: u=5ms^ - {}^{1}$

$\sf \: final \: velocity, \: v=8ms {}^{ - 1}$

; time, t=6s

$\sf \: Initial \: momentum \: \: =mu=100×5=500Ns$

$\sf \: Final \: momentum =mv=100×8=800Ns$

Force exerted on the object

$\sf \: F = \frac{mv - mu}{t} = \frac{800 - 600}{6} = \frac{300}{6} = 50n$

Hence, Answer is 50N