A body of mass 500 g is thrown upwards from the surface of a planet with velocity 20 m / s and reaches back to the surface of the planet after 20 s. Then the weight of the body on that planet is

Question

A body of mass 500 g is thrown upwards from the surface of a planet with velocity 20 m / s and reaches back to the surface of the planet after 20 s. Then the weight of the body on that planet is (A) 2 N (B) 4 N (C) 5 N (D) 1 N

Tardigrade Admin · Accepted Answer

Here, u=20 m / s , m=500 g =0.5 kg , t=20 s Using h=u t+(1/2) g t2 where g is the acceleration due to gravity on the planet. 0=20 × 20+(1/2)(-g)(20)2 or g=2 m / s 2 Weight of the body on the planet =m g=0.5 kg × 2 m / s 2=1 N

Q. A body of mass $500 g$ is thrown upwards from the surface of a planet with velocity $20 m / s$ and reaches back to the surface of the planet after $20 s$ . Then the weight of the body on that planet is

2 N

4 N

5 N

1 N

Here, $u = 20 m / s, m = 500 g = 0.5 k g, t = 20 s$
Using $h = u t + \frac{1}{2} g t^{2}$
where $g$ is the acceleration due to gravity on the planet.
$0 = 20 \times 20 + \frac{1}{2} (- g) (20)^{2}$ or $g = 2 m / s^{2}$
Weight of the body on the planet $= m g = 0.5 k g \times 2 m / s^{2} = 1 N$

Q. A body of mass 500g is thrown upwards from the surface of a planet with velocity 20m/s and reaches back to the surface of the planet after 20s. Then the weight of the body on that planet is

2 N

4 N

5 N

1 N

Here, u=20m/s,m=500g=0.5kg,t=20s Using h=ut+21​gt2 where g is the acceleration due to gravity on the planet. 0=20×20+21​(−g)(20)2 or g=2m/s2 Weight of the body on the planet =mg=0.5kg×2m/s2=1N

Q. A body of mass $500 g$ is thrown upwards from the surface of a planet with velocity $20 m / s$ and reaches back to the surface of the planet after $20 s$ . Then the weight of the body on that planet is

Here, $u = 20 m / s, m = 500 g = 0.5 k g, t = 20 s$
Using $h = u t + \frac{1}{2} g t^{2}$
where $g$ is the acceleration due to gravity on the planet.
$0 = 20 \times 20 + \frac{1}{2} (- g) (20)^{2}$ or $g = 2 m / s^{2}$
Weight of the body on the planet $= m g = 0.5 k g \times 2 m / s^{2} = 1 N$