Physics
During the motion of a projectile fired from the earth surface, ________

Its kinetic energy remains constant
Its momentum remains constant
Vertical component of its velocity remains constant
Horizontal component of its velocity remains constant

ANSWER DOWNLOAD EXAMIANS APP

Physics
It is easier to roll a barrel full of coal tar than to pull it because

more surface area of the barrel is in contact with the road when it is pulled
the rolling friction is much less than the sliding friction
coal tar is a liquid and it flows in the barrel when it is rolled
the full weight of the barrel comes into play when it is pulled

ANSWER DOWNLOAD EXAMIANS APP