Question

23.
A ball is thrown vertically upwards with a velocity of 20 m/s from the top of a multi-storey
building. The height of the point from where the ball is thrown 25 m from the ground.
i. How high will the ball rise?
ii. How long will it be before the ball hits the ground? Take g =10 m/s2.
24.
UN
tan (
a. Show that for a projectile the angle between the velocity and the x-axis as a function of
time is given by
Voy—
0(t) = tan
b. Show that the projection angle @ for a projectile launched from the origin is given by
80 =
-1 / 4h
R
where the symbols have their usual meaning.
A cyclist starts from the centre 0 of a circular park of radius 1 km, reaches the edge P of the
park, then cycles along the circumference, and returns to the centre along QO as shown in
figure. If the round trip takes 10 min, what is the
i. net displacement,
ii. average velocity, and
iii. average speed of the cyclist?
25.
State and prove the principle of law of conservation of linear momentum.​

Answer 1

Answer:

boll is not go veri far because of gravity it well be ...... 22m.