Mechanics | Relativity Answers

with what velocity must a ball be thrown vertically upward in order to rise a height of 50m? how long will it be in the air?

what is newton?

a body is projected at two complementary angles with same speed if maximum height reached by it are 40m and 90m find maximum range

A spring requires a force of 25 N to produce an extension of 2 cm in it. What is the work done in further extending it by 3 cm.

A weight of mass M is attached to the bottom end of a suspended spring. Initially the weight is supported with a board so that the spring is at its natural length. Next the board is gentally lowered. When the spring is extended distance D, the weight separates from the board and come to rest. Let the total mechanical energy of the spring and weight be defined as U1 and for the state after the weight separates from the board as U2. What is (U2-U1)?why is the answer (1/2)mgd?

a snail covers 100 metre in 50 hours calculate the average speed in km/hour.

A CAR MOVED 20 KM EAST AND 60 KM WEST IN 2 HOURS. FIND ITS AVERAGE VELOCITY.

A spelunker is surveying a cave. She follows a passage 150m straight west, then 230m in a direction 45∘ east of south, and then 280 m at 30∘ east of north. After a fourth unmeasured displacement, she finds herself back where she started.

Derive an equation for the path of a projectile fired parallel to horizontal.

Derive expressions for velocity and acceleration for uniform circular motion.
OR Derive expression for linear acceleration in uniform circular motion.