Question

. The velocity of an object increases at a constant rate from 20 m/s to 50 m/s in 10 s .Find the acceleration. *

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Answer 1

Step-by-step explanation:

Acceleration a=

t

v−u

=

10s

50 ms

−1

−20 ms

−1

or a=

10s

30 ms

−1

=3 ms

−2

Answer 2

GIVEN

• Initial Velocity , u = 20m/s
• Final Velocity , v = 50m/s
• Time , t = 10s

TO FIND

• Acceleration

SOLUTION

• From 1st eqn. of motion, we have

• v = u + at
• 50 = 20 + a × 10
• 10a = 50-20 m/s²
• a = 30/10 m/s²
• a = 3m/s²

• Acceleration of the object is 3m/s²