Question

A person rides a motor bike at the speed of 30m/ s. The person applies the brake and the velocity of motor bike comes down to 20m/ s in 3 s. What is the magnitude of acceleration of motor bike?

(a) - 3.3 m/ sec

(b) - 6.6 m/ sec

(c) 10 m/ sec

(d)16.6 m/ sec​

Answer 1

Answer:

a) -3.3 m/sec

Explanation:

Acceleration= (Final Velocity- Initial Velocity) / Time Taken

a= (20-30) / t

a= -3.3m/sec

Answer 2

Answer:

The acceleration is 3.33m/s².

Acceleration:

• Acceleration is defined as the rate of change of velocity with respect to time.
• It is a vector quantity and hence has magnitude and direction too.
• Since it is calculated as velocity per time, the units of acceleration are m/s².
• Its dimensions are L¹M⁰T⁻².

Explanation:

Given:

Initial velocity(u) = 30m/s

Final velocity(v) = 20m/s

Time(t) = 3ss

To find:

Acceleration of the bike (a) =?

Solution:

We use the first equation of motion to find the acceleration. It is given as follows:

v = u + at

Substituting the given values, we get

30 = 20 + a(3)

30-20 = 3a

10 = 3a

a = 10/3

a = 3.33m/s²

Therefore, the acceleration of the motorbike is 3.33m/s².

#SPJ3