Answer:
The <u>bus </u>will have the highest kinetic energy, while the <u>bicycle </u>will have the lowest kinetic energy.
Explanation:
The energy possessed by a body due to motion is known as kinetic energy. It depends upon the mass of a body and its speed.
It is given that a car, a bicycle, a bus and a motorcycle are moving parallel to each other at the same speed.
Since, the speed is same for all the vehicles, the kinetic energy will depend on the mass.
Mass of a bus is greatest and of a bicycle is the smallest. Thus, kinetic energy of bus would be highest and of the bicycle -lowest.
Answer:
Explanation:
We shall find first the velocity of ball at the time when string breaks. Let it be v . During its fall on the ground , 1.02 m below, we use the formula
h = 1/2 gt² where t is time of fall .
1.02 = 1/2 x 9.8 x t²
t²= .2081
t = .456
During this time it travels horizontally at distance of 2.5 m with uniform velocity of v
v x .456 = 2.5
v = 5.48 m /s
centripetal acceleration
= v² / r where r is radius of the circular path
= 5.48² / .478
= 62.82 m /s²
Answer:
Explanation:
When a player throws a football , he applies force on the ball , due to which ball accelerates in forward direction . This is the action force .
The ball also applies a force on the hand of the player . Due to it the player experiences a pushing force in backward direction . This is reaction force .
Due to this force , the player does not move in backward direction because of frictional force of the ground . The frictional force keeps him stationary .
