Here, u = 0 m/s, s = 20 m, a = 10 ms-2 ,
v = ?,
t = ?
Using v2 – u2 = 2as
We have, v2 – 02 = 2 × 10 × 20 = 400 ⇒ v = 20 ms-1 .
and t = (v – u) ÷ a = 20 ÷ 10 = 2 s
(a) Find how far does the car travel in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period. (b) Which part of the graph represents uniform motion of the car?
Question
A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10ms-2 , with what velocity will it strike the ground? After what time will it strike the ground?
- motion CBSE Class 9
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