Question

a body of mass 1 kg is allowed to fall freely under gravity. find the momentum and kinetic energy of the body 5 secs after it starts falling. take g= 10m/s^2.

Answer 1

GIVEN ;
m = 1kg
u =0
t = 5 sec
g = 10 m/s^2
v = ?


v = u+at
v = 0+10×5
v = 50 m/s

(1) momentum
= mv
= 1×50
= 50 kgm/s

(2) Kinetic energy
= 1/2 mv^2
=1/2 ×1 × 50 × 50
= 25×50
= 1250 Joule


hope this helped you .....

Answer 2

Answer:

Momentum is $50kgm/s^{2}$.

Kinetic energy is $1250J$.

Explanation:

It is given that a body of mass $1 kg$ is allowed to fall freely under gravity.

We need to determine the momentum and kinetic energy of the body $5$secs after it starts falling.

$g=10m/s^{2}$

$m=1kg$

$u=0$

$t=5s$

$v=?$

Using first equation of motion

$v = u+at$

$v = 0+10*5$

$v=50m/s$

Hence momentum is $mv=1*50=50kgm/s^{2}$

Now

Kinetic energy $=\frac{1}{2} mv^{2}$

$=\frac{1}{2} 1*50*50$

$=1250J$

#SPJ3