help again plz for q no. (b)
Answers
Explanation:
formula for KE 1/2 mv2
first case 1\2×50×25=625
second case 1/2×20×1.5×1.5=
find the difference and that is the answer
Answer:
hii
Explanation:
The law of conservation of momentum states that for two objects colliding in an isolated system,the total momentum before,and after the collision is equal.This is because the momentum lost by one object is equal to the momentum gained by other.
(b) m1 =50kg
V1 =5m/s
m2 =20kg
v2 =1.5m/s
after jump total mass=50+20=70.kg
final velocity =v
according to conservation of momentum
mv=m1v1+m2v2
70multiply v= 50 multiply 5 + 20 multiply 1.5
70v =280
v=4m/s.
(c)ans is rolling ball.
taking the formula of momentum p=mv,this is mass multiply velocity. Although the truch certainly have greater mass didnt have velocity mean not moving in any direction it is in rest.,therefore didnt have momentum.
The rolling ball have mass and velocity and it is moving ,so it have greater momentum then that.