Please see the questions below, thanks in advance! Acceleration remain constant

Question

Please see the questions below, thanks in advance!

Acceleration remain constant as a projectile moves through its parabolic trajectory. True False The Speed remain constant as a projectile moves through its parabolic trajectory. True False Which of the following is a scalar quantity? Speed Velocity Displacement Acceleration None of these A monkey is sitting at the top of a tree 20 m high from the ground level. A person standing on the ground wants to feed the monkey. He uses a bow and arrow to launch the food to the monkey. If the person knows that the monkey is going to drop from the tree at the same instant that the person launches the food, how should the person aim the arrow containing the food? He should aim it above the monkey. He should aim it below the monkey. He should aim it at the monkey. None of the other choices is correct. A projectile is launched with initial velocity v0 at an angle of 30 degree above the horizontal. If a second projectile is launched with the same initial velocity but at angle of 60 degree above the horizontal. The range of the second projectile will be 1.41 that of the first. The range of the second projectile will be twice that of the first. The range of the second projectile will be one-half that of the first. The ranges of the two projectiles will be identical. It is impossible to compare the ranges of the two projectiles.

Explanation / Answer

1) True, acceleration remains constant =downward g;

2) False, speed first decreases then again increases ;

3) Speed

4) option c;

5) range=V^2*sin(2*angle) / g ;

V is same , sin(60) = sin(120) ; so range would be same

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