i. State the kind of motion represented by OA and AB
ii. What is the velocity of the body after the 20s and after the 80s?
iii. Calculate the negative acceleration of the body.
iv. Calculate the distance covered by the body between 20th and 60th Seconds.
OR
(a) Define S.I, unit of force
(b) Mention any two effects of force
(c) A body of mass 60 kg has momentum of 300 kg m/s. Calculate its velocity.
d) Why does a carpet beaten
Answers & Comments
Verified answer
Answer:
(i) OA has got uniform acceleration and AB has got uniform retardation.
(ii) Velocity of body after 20 seconds is 20 m/s and velocity of body after 80 seconds is 0 m/s (as body has come to a stop).
(iii) Negative accl.=v-u/t = 0-20/60 = -20/60 is approximately (-0.3) m/s^2.
(iv)Dist.=60×20 =1200m
OR
(i) SI unit of force is Newton(N)
(ii) First effect=> It can change the shape of a body
Second effect=>It can make a body to accelerate
(iii)P=m*v
300=60*v
v=300/60=5 m/s
(iv)(this is not the answer) Please send complete question as it is not understandable.