Question

i wanna know this answer !

Answer 1

Hi Mate!!!

MOmentum at highest point is ( p ) = m ( u - v ) / t

Where m is mass, u is inial velocity, v is final velocity and t is time taking at the highest point.

V = 0

U = 20 m/s

t can be calculated as V = U - g t

t = 20 / 10 = 2 m /s

p = 1 /5 ( 20 ) / 2 = 2 kg m/s

Answer 2

Answer:

p = 4 kg-m/s

Step-by-step explanation:

Given,

A ball weighing  200g  is  thrown vertically upward with a  speed  of  20m/s.

m = 200 g = 0.2 kg

u = 20 m/s (Inital Velocity)

Now, We  need  to calculate  the  time  to reach at  highest  point with speed  of  20m/s

At  the  highest  point  its  final velocity(v) will be zero.

Using  newton's first  equation of  motion.

v = u - gt

0 = 20 - 10*t

40 = 10t

t = 4 second

Now,

Force acting  on body due  to gravity, F = mg = 0.2 × 10  

F = 2 N

We  know that,

According to newton's second  law  of  motion,

$F=\frac{dp}{dt}\\\;\\dp=F.dt\\\;\\Integrating\;both\;sides\\\;\\\int{dp}=F\int{dt}\\\;\\p=Ft\\\;\\p=2\times2\\\;\\p=4\;N-s\\\;\\p=4\;kg-m/s$