the mass of a car. is 1400 kg the car intially at rest is moved along a level road by a resultant force 3500 N. the car reaches a speed of 30 m/s
Answers
Answer:
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Explanation:
Given :
Mass of the car = 1400kg
Initial velocity = zero
Resultant force = 3500N
Finql velocity = 30m/s
To Find :
Acceleration of car
Time of journey
Name of a force which opposes the motion of car
Solution :
❖ As per newton's second law of motion, force is defined as the product of mass and acceleration.
➙ F = m a
F demotes force
m denotes mass
a denotes acceleration
➙ 3500 = 1400 × a
➙ a = 3500/1400
➙ a = 2.5 m/s²
♦ Time of journey :
We know that acceleration is defined as the rate of change of velocity
Mathematically, a = (v - u) / t
v denotes final velocity
u denotes initial velocity
t denotes time
➙ 2.5 = (30 - 0) / t
➙ t = 30/2.5
➙ t = 12 s
♦ Frictional force opposes the motion of car.