A body of mass 5kg changes its velocity from 4m/a to 24m/s in 10s.Calculate it’s acceleration,the force needed to cause this acceleration and the momentum at rest.
Answers
Answer:
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Explanation:
Given,
Mass =5 kg
Velocity =4m/s
Net force will be 0 . This is because an object moving with a uniform speed has zero acceleration, there is no change in velocity.
And according to Newton's second law of motion, we know, Acceleration is directly proportional to Force.
If acceleration =0
Force = Mass × Acceleration
Force = Mass × 0
Force = 0
Thus, Net force acting on the body is 0.
Given: Mass of body, m = 5kg
Time, t = 10s
Initial velocity, u = 4m/s
Final velocity, v = 24m/s
To Find: Acceleration a, Force F, Momentum p.
Solution:
To calculate "a" 1st law of motion equation is used
v = u + at
a = v-u/t
a = 24 - 4/10
a = 20/10
a = 2m/s²
For calculating force - F, formula used:
F = m x a
F = 5 x 2
F = 10 N
For calculating momentum, the formula used:
p = m x v
At rest, v= 0
p = m x 0
p = 0
Hence, p = 0 at rest, F = 10 N and a = 2m/s²