First slide

Instantaneous velocity

Question

Velocity of a particle moving with uniform acceleration at some instant is 10 m/s. After 5 seconds from that instant its velocity becomes 20 m/s. Its velocity 3 seconds before the instant is

Easy

A

8 m/s
B

4 m/s
C

6 m/s
D

7 m/s

Solution

$v = u + a t : 20 = 10 + 5 a; a = 2 v e l o c i t y 3 s e c b e f o r e v = u - a t; v = 10 - 3 \times 2 = 4 m / s$

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